题目内容

The students expected there ____more reviewing classes before the final exams.

A. to be B. are C. being D. is

 

A

【解析】

试题分析：句意：学生们期望在期末考试前有更多的复习课。考查非谓语动词(不定式)的there be句型：expect后面接不定式结构。所以是there to be结构。选A。

考点：考查there be句型和不定式

 

练习册系列答案
相关题目

—I had the computers repaired yesterday.

—How much did they _________ for that?

A. costB. spendC. takeD. charge

 

What will power your house in the future？Nuclear，wind，or solar power？According to scientists at the Massachusetts Institute of Technology (MIT) in the US，it might be leaves — but artificial (人造的) ones.

Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用)．Now researchers have found a way to imitate this seemingly simple process.

The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip with catalysts (催化剂)．Similar to natural leaves，it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell，which uses those two materials to produce electricity，located either on top of a house or beside the house.

Though the leaf is only about the shape of a poker card，scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Nocera at a conference of the American Chemical Society.

The artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf，by contrast，is made of cheap materials，easy to use and highly stable. In laboratory studies，Nocera showed that an artificial leaf prototype (原型) could operate continuously for at least 45 hours without a drop in activity.

The wonderful improvements come from Nocera's recent discovery of several powerful，new and inexpensive catalysts. These catalysts make the energy transformation inside the leaf more efficient with water and sunlight. Right now，the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides，the device can run in whatever water is available；that is，it doesn't need pure water. This is important for some countries that don't have access to pure water.

With the goal to “make each home its own power station” and “give energy to the poor”，scientists believe that the new technology could be widely used in developing countries，especially in India and rural China.

1.Which of the following orders correctly shows how the artificial leaf is used to produce electricity?

a．artificial leaves split water into hydrogen and oxygen

b．the hydrogen and oxygen gases are stored in a fuel cell

c．the artificial leaves are put in water

d．the fuel cell uses hydrogen and oxygen to produce electricity

A. c，a，b，d B．c，b，a，d

C．b，c，a，d D．c，a，d，b

2.The purpose of the scientists at MIT in developing the new artificial leaf is to________.

A．build up more power stations in the world

B．provide cheaper energy for developing countries

C．offer people in developing countries access to pure water

D．gain a deeper understanding of the photosynthesis process

3.The main idea of this passage is ________.

A．an introduction to the history of artificial leaves

B．a mixture of water power and solar energy

C．giving energy to the poor

D．an invention copying photosynthesis

 

People in several American states may be surprised to see cars on city streets without a driver. Experimental driverless vehicles now are legal in Florida, Nevada and California. They are pointing the way to a future that is not far down the road. The high-tech company Google has a number of self-driving cars, which had covered 480,000 kilometers by August. Volvo is among the companies doing road tests and says it plans to sell driverless cars by 2020.

In September, California Governor Jerry Brown signed an act to allow autonomous vehicles on the roads of his state. “Today we’re looking at science fiction becoming tomorrow’s reality—the driverless car.” The technology for these cars includes cameras, radar and motion sensors. The systems have been improved through competitions sponsored by the US government agency DARPA. Engineer Richard Mason of the Rand Corporation helped design driverless vehicles for DARPA challenge races.

“Cars have become much more fuel-efficient, and new electronic features are making Hondas safer,” said Angie Nucci of Honda America. “A camera on the passenger-side mirror actually engaged on your guiding screen so you can safely change lanes.” Other safety features include warning systems on the front and the sides of the cars. These systems help drivers, but don’t replace them. Curator Leslie Kendall of the Petersen Automotive Museum said autonomous cars will make the high ways safer．

“By taking out drivers, you also remove most risks of an accident,” Kendall said. He said consumers, however, may be unwilling to lose control. “It may take them time to come to realize that the technology is indeed reliable, but it will have to prove itself first.”

Mason said the technology already works and the biggest challenge now is getting down the cost for driverless vehicles from hundreds of thousands of dollars to something more affordable. He said this will happen as the technology is improved.

1.What can we learn from Paragraph l?

A. Volvo will be the first to sell driverless cars.

B. Driverless cars are pointing us a faraway future.

C. Driverless vehicles are now legal in the whole USA.

D. Google’s self-driving cars have covered a long distance.

2.We learn that Governor of California Jerry Brown_________.

A. helped design self-driving cars

B. supports self-driving cars on roads

C. considers self-driving cars science fiction

D. improved the self-driving car systems

3.According to Richard Mason, what is the biggest challenge for driverless cars?

A. They are not allowed to run on the road.

B. Their technical problems remain to be solved.

C. They are now too expensive for consumers.

D. They are more dangerous for people on the street.

4.Which is the best title for the passage?

A. The Benefits of the Self-driving Cars

B. The Biggest Challenge of the Self-driving Cars

C. Safer or More Dangerous Self-driving Cars

D. Self-driving Cars—Science Fiction Future Is Near

 

Back in the early 1900s, American physician Byron Robinson wrote a book proposing an interesting theory: humans actually have two brains --- one in our heads and the other in our stomachs, and the two “communicate” all the time. Interestingly, in Chinese culture, thoughts are also related to the belly in phrases and idioms like fugao (腹稿, a draft), manfu jinglun (满腹经纶, a bellyful of ideas), and yiduzi weiqu (一肚子委屈, a bellyful of complaints).

This may sound a little ridiculous at first. But try to think of a time when you were extremely nervous. Chances are that you also felt uncomfortable in your stomach, didn’t you? This is probably why people use the idiom “butterflies in one’s stomach” to refer to being nervous.

Now scientists from Canada and the US have found that our guts (肠道), if not as bright as our actual brains, are much more than just where we digest the food we eat. They also affect our emotions and even behavior, all thanks to the bacteria in them, reported Scientific American.

In the study, scientists fed timid mice stomach bacteria from mice that were more active and daring. After eating the bacteria, the timid mice grew more energetic and fearless. Sure enough, when bold mice got the bacteria from timid ones, they became more anxious. The mice’s behavior also changed when scientists disturbed the bacteria in their guts by changing their diets and feeding them antibiotics (抗生素).

“If something goes wrong in the gut, that change is reflected in the brain,” Emeran Mayer, a professor at University of California, Los Angeles, told The Huffington Post.

The brain-and-gut connection also works in the opposite way. Scientists studied children with autism (自闭症) --- a mental illness that makes people unable to socialize with others --- and found that they also have a lot of stomach problems. They have fewer types of stomach bacteria and lower totals of a few key bacteria than healthy children.

This research raises the possibility that scientists could treat patients with brain problems simply by feeding them the right food, which would be much more efficient than providing psychological therapy (疗法).

According to CBC News, you can get “good” bacteria that lift your spirits from food like yogurt while “bad” bacteria are usually in high fat and high sugar foods.

1.What is the author’s attitude toward Byron Robinson’s theory of two human brains?

A. Unsatisfied. B. Doubtful. C. Positive. D. Negative.

2.The author mentioned the idiom “butterflies in one’s stomach” in the second paragraph to _____.

A. describe the symptoms of nervousness

B. suggest a connection between our stomach and our emotions

C. hint at the danger of nervous feelings

D. encourage people to calm down and relax

3.What’s the closest meaning of the underlined word “bold” in Paragraph 4?

A. anxious B. fearless C. energetic D. sharp

4.According to the article, ______.

A. people with mental illnesses are more likely to have stomach problems

B. the use of antibiotics can turn timid mice into daring ones

C. timid mice have fewer types of stomach bacteria than daring mice

D. people must consider changing their diets when they feel anxious

5.We can infer from the article that______.

A. psychological therapy has never worked before for autistic children

B. yogurt is the best solution for anxiety problems

C. high fat and high sugar foods are responsible for many mental diseases

D. diet changes can lead to mood changes

 

---Why not wear your miniskirt, Rose?

--- Well, my legs are too thick, if you ______ know.

A. should B. must C. may D. need

 

It is said that the engines of Flight MH370____while flying over the Indian Ocean,with all on board killed .

A. broke out B. ran out C. gave out D. wore out

 

This company is going to ________some 160 employees because of the drop in sales.

A. lay off B. lay aside C. lay down D. lay out

 

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网