Shall we take the 10:00train? No．If we took that train.we too late．( )A．arriveB．arrivedC．will arriveD．would arrive 题目和参考答案——青夏教育精英家教网—

题目内容

1．Shall we take the 10：00train？
No．If we took that train，we ________ too late．（　　）

A．

arrive

B．

arrived

C．

will arrive

D．

would arrive

分析我们坐10点的火车吗？
不．如果我们坐那趟火车，我们会到的太晚．

解答答案：D．根据语境可知，本句表达了与现在事实相反的情况，因此本句是if虚拟条件句；if从句使用一般过去时，主句应使用would/should/could等情态动词+do的形式；故选D．

点评本题考查了虚拟条件句的用法．做本题时，首先应根据句意或if从句所使用的时态，判断本句是虚拟条件句，表达的是与现在事实相反的情况，从而确定主句应使用的形式；另外，应熟练掌握虚拟条件句中关于时态对称的用法．

练习册系列答案

12．President Barack Obama rode a bicycle at the White House Science Fair on April 22．But it wasn't an ordinary bike．As he pedaled，the President stayed in place，while the energy from his pedaling powered a water filtration （过滤） system．He was testing an invention created by a team of 14students from Northeast High School，in Oakland Park，Florida．
Payton Karr，16，and Kiona Elliot，18，attended the fair as representatives of the project．"We were hoping President Obama would ride the bike，but we didn't actually expect him to，"Payton told TFK．"It really meant a lot．"Kiona agreed．"It was pretty awesome to see the invention，which was invented by a group of 14high school students and one teacher，along with the help of community members，got the interest of the leader of our nation，"she said．
The project was an idea that came about after one of the Northeast students，Kalie Hoke，visited Haiti after the terrible 2010earthquake and saw how difficult it was to find clean water．The students invented a portable（便携的），bicycle-powered emergency water filtration system，which can provide 20-30people with drinking water in a 15-hour period．The teens hope their invention will one day be used by relief organizations like the Red Cross．"They can take it to places after natural disasters so that water can be clean for the people there，"said Payton．
Payton and Kiona were among the 100students from more than 40states invited to the third annual White House Science Fair，in Washington，D．C．，which is also attended by leaders in science and education．President Obama started the event in 2010to stimulate students interested in STEM （Science，Technology，Engineering，Maths）．"Well，if you're a young person and you produce the best experiment or design，you ought to be recognized for that achievement，"Obama said when he first announced the fair．
President Obama praised the projects during a speech to attendees after the fair．"The science fair projects of today could become the products and businesses of tomorrow，"he said．"If you're inventing things in the third grade，what are you going to do by the time you get to college？"

36．What is special about the bicycle President Obama rode？C
A．It can move very fast．
B．It is extremely beautiful．
C．It is used to make water clean．
D．It is made of eco-friendly materials．
37．The representatives of the bicycle-powered water filtration systemD．
A．were both community members
B．graduated from a famous university
C．finished the project with the help of their parents
D．were surprised that their invention interested Obama
38．The bicycle-powered water filtration system was designedD．
A．at the request of the Red Cross
B．for city families to get pure water
C．during the terrible 2010earthquake in Haiti
D．to provide people in disaster areas with clean water
39．The underlined word"stimulate"in Paragraph 4can be replaced byB．
A．help B．inspire C．change D．entertain
40．We can know from the last sentence in the passage that President ObamaD．
A．wanted the youth to have big dreams
B．encouraged the youth to go to college
C．worried the young inventors would do nothing in college
D．believed the young inventors would have a promising future．

9．At present，in many American cities expecially，many teachers in the public schools say they are underpaid．They point to jobs such as secretary or truck driver，which often pay more to start thanthatof a teacher．In many other fields，such as law，medicine，computer science，a beginning worker may make more than a teacher who has taught for several years．
         Teaching has never been a profession that attracted people interested in high salaries．It is by history a profession that has provided rewards in addition to money-the satisfaction of sharing knowledge，of influencing others，of guiding young people．But in the past several years，there are more difficulties in teaching，for many，than there are rewards．
    Unruly students，especially in big cities，large classes and a lack of support from the public in terms of money and understanding have led many public school teachers to leave the profession．
         As a result，many of the best students，who would have chosen teaching as their life career in the past，are going into other fields．
         Another reason for this change in teacher candidates is the changing status of women in the United States．Until the late 1960s and 1970s，one of the most popular choices for women was teaching．But as other professions，such as law and medicine opened up to women，women stopped pouring into teacher training programs．Thus，a major pool of excellent candidates for the teaching profession dwindled．
         Bit by bit government officials and others realized that the status of the teacher had suffered．They talked about change．But the change in a vast society like the United States is not easy．People's attitudes have formed over many years，and sometimes change takes many years．
63．The underlined word"that"in Paragraph 1 refers to"B"．
A．money
B．job
C．secretary
D．truck driver
64．What is the present situation of the teaching？A
A．Teachers work harder and get underpaid．
B．Teahcers have no opportunities to work in other fields．
C．Teaching can attract best students to work as a teacher．
D．Teaching can provide rewards as well as high salaries．
65．Many public school teachers turn to other professions becauseD．
A．the government doesn't finacially support them
B．they have to work longer hours than a lawyer
C．their students refuse to listen to them
D．they are not fairly treated
66．The author believes that change in teachers'status in the United StatesD．
A．is not great
B．is impossible
C．influences people's attitude
D．needs time．

16．Perhaps I'm not quite fit for the job，but ________，please let me．have a try．（　　）

6．Antarctica's Lake Vostok has long been a mystery to scientists．Sealed（密封） off from the outside world for millions of years，Vostok is buried beneath 13 000feet of ice．The huge underground lake is the size of Lake Ontario and is located in one of Antarctica's coldest regions．Scientists want to know：What lives below the ice？
They might find out soon．After more than 10years，a team of Russian scientists have finally been able to drill through the ice into Vostok's ancient waters．Vostok lies below one of the coldest zones on Earth，and the ice here is denser than ice elsewhere on the planet．Drilling can take place each year only during Antarctica's warmest weather．This is when the ice is easier to drill，and the temperatures are not as severe for scientists living in the Vostok Research Station，which is above the lake．Numerous past attempts to reach the lake，including one last year，failed because the scientists did not finish drilling before the weather became too cold．
Scientists estimate that Vostok has been closed off from the outside world for approximately 30million years．Signs of tiny organisms called microbes （微生物）were discovered years ago in the ice above the lake．Some researchers think similar lifeforms could be thriving （兴盛的，繁荣的） below the ice shielding （防护，保护）Vostok's waters．
Ancient forms of life that could remain in these waters might reveal new information about how organisms can survive in extreme environments，and about how life used to exist on Earth millions of years ago．"For me，the discovery of this lake is comparable with the first flight into space，"says expedition director Valery Lukin．"By technological complexity，by importance，by uniqueness．"
More than 350underground lakes are frozen below Antarctica，and Lake Vostok is one of the largest．Teams of scientists are now planning to drill into similar lakes throughout Antarctica．In December（summertime in the Southern Hemisphere），an American team will be tunneling into Lake Whillans near the South Pole，and a British team will attempt to reach Lake Ellsworth in West Antarctica．

66．Russian scientists drilled through the ice into Lake VostokB．
A．to fetch some ancient water
B．to find some ancient forms of life
C．to explore natural resources
D．to measure the thickness of ice
67．It can be inferred that the task of Russian scientists drillingA．
A．was not easy
B．was a piece of cake
C．was done all through the year
D．never achieved success
68．Based on their findings what are researchers expected to do？D
A．To know the geographical features of Antarctica．
B．To solve mysteries of the ice at the South Pole．
C．To analyze the evolution history of the earth．
D．To open Antarctica's 30millionyearold secrets．
69．Research on Antarctica underground lakes like these can be consideredC．
A．the path of guiding human development
B．the result of human struggle for existence
C．a new frontier for scientists
D．a great victory against nature
70．Which of the following statements is NOT true？D
A．The floor of Antarctica is almost as irregular as the exposed land areas．
B．British and US teams are targeting Lakes Ellsworth and Whillans respectively．
C．The attempt to drill might fail during the Antarctic winter．
D．What was in the waters of Antarctica lakes has been revealed．

13．Here is an astonishing and significant fact：Mental work alone can't make us tire．It  sounds absurd．But a few years ago，scientists tried to find out how long the human brain  could labor without reaching a stage of fatigue（疲劳）．To the amazement of these scientists，they discovered that blood passing through the brain，when it is active，shows no fatigue at all!If we took a drop of blood from a day laborer，we would find it full of fatigue toxins at and fatigue products．But if we took blood from the brain of an Albert Einstein，it would show no fatigue toxins at the end of the day．
So far as the brain is concerned，it can work as well and swiftly at the end of eight or  even twelve hours of effort as at the beginning．The brain is totally tireless．So what makes us tired？
Some scientists declare that most of our fatigue comes from our mental and emotional attitudes．One of England's most outstanding scientists，J．A．Hadfield，says，"The greater part of the fatigue from which we suffer is of mental origin．In fact，fatigue of purely physical origin is rare．"Dr．Brill，a famous American scientist，goes even further，He declares，"One hundred percent of the fatigue of sitting worker in good health is due to emotional problems．"
What kinds of emotions make sitting workers tired？Joy？Satisfaction？No!A feeling of being bored，anger，anxiety，tenseness，worry，a feeling of not being appreciated-those are the emotions that tire sitting workers．Hard work by itself seldom causes fatigue．We get tired because our emotions produce nervousness in the body．

24．What surprised the scientists a few years ago？C
A．Fatigue toxins could hardly be found in a laborer's blood．
B．Albert Einstein didn't feel worn after a day's work．
C．The brain could work for many hours without fatigue．
D．A mental worker's blood was filled with fatigue toxins．
25．According to the author，which of the following can make sitting workers tired？B
A．Challenging mental work
B．Unpleasant emotions
C．Endless tasks
D．Physical labor．
26．What's the author's attitude towards the scientists'idea？A
A．He agrees with them．    B．He doubts them．
C．He argues against them． D．He hesitates to accept them．
27．What do sitting workers need to do in order to stay energetic？B
A．Have some good food．    B．Enjoy their work．
C．Exercise regularly．     D．Discover fatigue toxins．

10．How to Get Motivated
You must think positively no matter how big a challenge is．If you think positively，you will feel better and will be able to overcome challenges in life．Furthermore，meet an optimistic person and you will notice how motivated he is towards life．（16）E On the other hand，negative thinking will only cause more depression in your life．
（17）D Don't be jealous of those who are successful around you．Instead，take inspiration from their success stories．This will make you motivated to get what you want．Moreover，you can also read books that are written by inspirational and successful personalities．
There is a famous quote that reads，"A healthy body leads to a healthy mind．"If your mind is healthy，you will think positively．（18）A Whether you are working out in the gym or going for a long walk，make sure that you incorporate an exercise plan in your daily routine．
（19）C Therefore，it is important to break your routine and do something different．Whether you go on a vacation or learn a new skill，it is important to break the monotony（单调）in your daily life．
Human beings are extraordinary individuals who are able to complete the hardest tasks and achieve the impossible．It is important to get out of your comfort zone and try something different．（20）F
A．Therefore，it is important to exercise regularly．
B．Keeping yourself motivated is not a difficult task．
C．You might lose motivation by doing the same things over and over again．
D．One of the best ways to motivate oneself is to get inspired by others'success．
E．Remember，positive thinking gives you motivation to achieve what you want．
F．By doing so you will get motivated and your attitudes towards life will be positive．
G．Do things that make you happy and find inspiration in possibly everything you see．

9．Many drivers dream of the day when they can sit back while their car drives itself．While several companies are working hard to make （33）it a reality，self-driving cars still face many problems．
Google was one of the first （34）to get （get） into this industry．It （35）has been developing （develop） self-driving cars since 2009，and its new driverless car is called Firely．
But the driverless car is only a"fair weather friend"，the Daily Mail commented．
According to the MIT Technology Review，the current driverless cars can't react like a human driver．They can't drive in heavy rain or snow．
Chris Urmson，director of the Google car team，said that this is because the detection technology is not yet good enough to separate certain objects from weather conditions．In the cars'eyes，raindrops and snowflakes are the same as rocks，and cars stop for them．But if the manhole（下水道入口）ahead is left （36）uncovered （uncover），they drive over it without hesitation．
（37）Despite all these problems，Urmson said driverless cars will happen more quickly than people think．
But even at that time，driverless cars won't be truly"driverless．"
In the US，only when someone sits in the driver's seat （38）are driverless cars allowed on roads in certain states
European countries，Mexico，Chile，Brazil and Russian follow the United Nations Convention on Road Traffic．The convention used to say："Every driver （39）shall at all times be able to control his vehicle or to guide his animals．"A change was agreed in May，allowing a car to drive itself （40）as long as/on condition that a driver is in the car and able to take the wheel at any time．

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