在-前面ahead of．题目和参考答案——青夏教育精英家教网—

题目内容

3．在…前面ahead of．

分析 ahead of 在…前面

解答答案：ahead of 在…前面
Two boys were ahead of us．
有两个男孩在我们前面．
I finished several days ahead of the deadline．
我是在最后期限的前几天完成的．

点评对于单词短语的识记，要从词义着手，理解词性和常见用法或搭配，并能在语境中灵活运用．

练习册系列答案

14．On a stormy day last August，Tim heard some shouting．Looking out to the sea carefully，he saw a couple of kids in a rowboat were being pulled out to sea．
Two 12-year-old boys，Christian and Jack，rowed out a boat to search for a football．Once they'd
rowed beyond the calm waters，a beach umbrella tied to the boat caught the wind and pulled the boat into open water．The pair panicked and tried to row back to shore．But they were no match fo it and
the boat was out of control．
Tim knew it would soon be swallowed by the waves．"Everything went quiet in my head，"Tim
recalls（回忆），"I'm trying to figure out how to swim to the boys in a straight line．"
Tim took off his clothes and jumped into the water．Every 500 yards or so，he raised his head to
judge his progress．"At one point，I considered turning back，"he says．"I wondered if I was putting
my life at risk．"After 30 minutes of struggling，he was close enough to yell to the boys，"Take down
the umbrella!"
Christian made much effort to take down the umbrella．Then Tim was able to catch up and climb
aboard the boat．He took over rowing，but the waves were almost too strong for him．
"Let's aim for the pier（码头），"Jack said．Tim turned the boat toward it．Soon afterward，
waves crashed over the boat，and it beganto sink．"Can you guys swim？"he cried．"A little bit，"the
boys said．Once they were in the water，Tim decided it would be safer and faster for him to pull the boys
toward the pier．Christian and Jack were wearing life jackets and floated on their backs．Tim swam
toward land as water washed over the boys'faces．
"Are we almost there？"they asked again and again．"Yes，"Tim told them each time．
After 30 minutes，they reached the pier．
21．Why did the two boys go to the sea？B
A．To go boat rowing．
B．To get back their football．
C．To swim in the open water．
D．To test the umbrella as a sail．
22．Why did Tim raise his head regularly？C
A．To take in enough fresh air．
B．To consider turning back or not．
C．To check his distance from the boys．
D．To ask the boys to take down the umbrella．
23．How can the two boys finally reach the pier？A
A．They were dragged to the pier by Tim．
B．They swam to the pier all by themselves．
C．They were washed to the pier by the waves．
D．They were carried to the pier by Tim on his back．

11．We tend to think of plants as the furniture of the natural world．They don't move，they don't make sounds and they don't seem to respond to anything-at least not very quickly．But as is often the case，our human's view of the world misses quite a lot．Plants talk to each other all the time．And the language is chemical．
Over the years，scientists have reported that different types of plants，from trees to tomatoes，release compounds（化合物） into the air to help neighboring plants．These chemical warnings all have the same purpose-to spread information about one plant's disease or infestation so other plants can defend themselves．But exactly how plants receive and act on many of these signals is still mysterious．
In this week's Proceedings of the National Academy of Sciences，researchers in Japan offered some explanations．They had identified one chemical message and traced it all the way from release to action．
The scientists looked at tomato plants infested by a common pest，the cutworm．The researchers studied leaves from exposed and unexposed plants．They found one compound showed up more often in the exposed plants．The substance is called HexVic．When the scientists fed HexVic to cutworms，it knocked down their survival rate by 17%．The scientists identified the source of HexVic，and sprayed it lightly over healthy plants．Those plants were then able to start producing the cutwormkilling HexVic．Researchers confirmed that uninfected plants have to build their own weapons to fight off bugs and disease．How do they know when to play defense？They are warned first by their friendly plant neighbors．
It is a complex tale，and it may be happening in more plant species than tomatoes．It may also be happening with more chemical signals that are still unknown to us．Further studies are needed to increase agricultural efficiency．
25．How do plants warn their neighbors？B
A．They make use of winds．
B．They release some chemicals．
C．They identify the chemicals．
D．They are exposed early．
26．What's the function of HexVic？A
A．It damages the cutworm's body．
B．It shows up more．
C．It cures the disease．
D．It sprays over healthy plants．
27．It can be inferred from the text thatC．
A．there are not chemical signals
B．the phenomenon may be happening in less plant species than tomatoes
C．farmers may benefit from the further studies
D．plants are warned first by their neighbors
28．The passage is likely to appear inC．
A．a newspaper advertisement
B．a physics textbook
C．a science magazine
D．a finance report．

18．Across Britain，burnt toast will be served to mothers in bed this morning as older sons and daughters rush to delivertheir supermarket bunches of flowersBut，according to a new study，we should be placing a higher value on motherhood all year．
Mothers have long known that their home workload was just as heavy as paid work．Now，the new study has shown that if they were paid for their parental labours，they would earn as much as£172，000a year．
The study looked at the range of jobs mothers do，as well as the hours they are working，to determine the figure．This would make their yearly income£30，000more than the Prime Minister earns．
By analyzing the numbers，it found the average mother works 119hours a week，40of which would usually be paid at a standard rate 79hours as overtime．After questioning 1，000mothers with children under 18，it found that，on most days，mums started their routine work at 7am and finished at around 11pm．
To calculate just how much mothers would earn from that labour，it suggested some of the roles that mums could take on，including housekeeper，part-time lawyer，personal trainer and entertainer．Being a part-time lawyer，at£48，98an hour，would prove to be te most profitable of the"mum jobs"，with psychologist（心理学家） a close second．
It also asked mothers about the challenges they face，with 80per cent making emotional（情感的） demand as the hardest thing about motherhood．
Over a third of mums felt they needed more training and around half said they missed going out with friends．
The study shows mothers matter all year long and not just on Mother's Day．The emotional，physical and mental energy mothers devote to their children can be never-ending，but children are also sources of great joy and happiness．Investing（投入） in time for parenting and raising relationships is money well spent．
25．How much would a mother earn a year if working as the Prime Minister？C
A．£30，000．
B．£172，000．
C．£142，000．
D．£202，000．
26．The biggest challenge for most mothers is fromB．
A．low pay for work
B．emotional demand
C．heavy workload
D．lack of training
27．What is stressed in the last paragraph？B
A．mothers'importance shows in family all year long．
B．The sacrifices（牺牲） mothers make are huge but worthwhile．
C．Mothers'devotion to children can hardly be calculated（计算）．
D．Investing time in parenting would bring a financial return．
28．What can we conclude from the study？C
A．Mothers'working hours should be largely reduced．
B．Mothers should balance their time for work and rest．
C．Mothers'labour is of a higher value than it is realized．
D．Mothers should be freed from housework for social life．

8．electric shock电击．

15．If you need glasses to read this，you are among the majority of Chinese students．That's because most students in China are short-sighted which means they can only see things close up and distant things will be blurry．Four-fifths of high school students wear glasses and now more and more children in primary school need glasses，too．
This epidemic of poor eyesight has two very simple causes：too much time spent indoors studying and too little time spent outdoors playing．Reading and writing for hours and hours，sometimes in poorly lighted rooms，causes eyesight to weaken．But students have to do this because there is so much pressure on them to succeed in school．And because they spend so much time indoors at school and at home，they have less time to spend outdoors enjoying the sun．
The sun，as a consequence，is important in developing good eyesight．Exposure to daylight releases a chemical in the eyes that prevents，or at least delays，short-sightedness．According to a study by Ian Morgan of Australian National University，Australian children and Chinese children have the same level of eyesight before they start school，but once they enter primary school，Chinese children only spend about an hour a day outside，while Australian children spend three to four hours each day in the sunshine．The result is that while about 40percent of Chinese primary school students need glasses，only three percent of Australian children do．
Wearing glasses may not seem like a big deal．For some，wearing glasses can even be an opportunity to make a fashion statement．But poor eyesight at a young age can have serious long term consequences．As you get older，your eyesight can worsen and lead to things like macular degeneration（黄斑变性），a condition of the eyes for which there is no cure and which can eventually lead to blindness．
With all that in mind，don't you think it's time to give your eyes a break？Try spending a little less time inside and go for a walk in the park，instead．It's the healthy thing to do and your eyes will thank you for it．
7．What does the underlined word"blurry"mean？C
A．Unpopular
B．Unpleasant
C．Unclear
D．Unconscious
8．How should the students protect their eyesight according to the passage？B
A．They should study less and less．
B．They should stay longer outdoors．
C．They should wear sunglasses．
D．They should have a longer rest in bed．
9．It can be inferred from the passage thatB is to blame for the poor eyesight of Chinese children．
A．the ever-worsening bad weather
B．the ever-increasing burden of study
C．the ever-decreasing sunny days
D．the ever-decreasing period of study time
10．What is the purpose of this article？D
A．To explain why Chinese students are poor-sighted．
B．To admire Australian children's good eyesight．
C．To criticize the present education system．
D．To call on people to protect Chinese children's eyesight．

12．仁慈；宽恕 n．mercy．

13．Assuming/Supposing/Suppose/Provided/Providing（假设） that there is a lack of money，who can we turn to for help？

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