[填空题]Science may never answer the most puzzling of all dinosaur questions. What killed these mighty creatures
One of the most popular theories about the death of the dinosaurs is that the world just grew too cold for them. Indeed, for large, coldblooded creatures, even a few nights of cold could spell death. How could the weather have changed Scientists think there might have been a cooling in the earth’s atmosphere during the Late Cretaceous Period.
16. ______
Not everyone agrees that a change in weather would have been enough to kill the dinosaurs. Some scientists say that dinosaurs might have been warm-blooded. Warm-blooded animals are able to make their own body heat. They can live in much colder climates than coldblooded animals.
17. ______
In the late 1970s, a naturalist named Walter Alvarez was studying the layer of rock that marks the end of the Age of Dinosaurs. He made a puzzling discovery. Alvarez found a layer of clay which contained a great

[填空题]Science may never answer the most puzzling of all dinosaur questions. What killed these mighty creatures
One of the most popular theories about the death of the dinosaurs is that the world just grew too cold for them. Indeed, for large, coldblooded creatures, even a few nights of cold could spell death. How could the weather have changed Scientists think there might have been a cooling in the earth’s atmosphere during the Late Cretaceous Period.
16. ______
Not everyone agrees that a change in weather would have been enough to kill the dinosaurs. Some scientists say that dinosaurs might have been warm-blooded. Warm-blooded animals are able to make their own body heat. They can live in much colder climates than coldblooded animals.
17. ______
In the late 1970s, a naturalist named Walter Alvarez was studying the layer of rock that marks the end of the Age of Dinosaurs. He made a puzzling discovery. Alvarez found a layer of clay which contained a great

[单项选择]Questions 1--3 Choose the best answer.

Most of the visitors who came to the museum ______.
A. went on guided tours in the museum building without seeing the squid
B. had seen the squid on TV before they came to the museum
C. saw the squid without being guided by the museum staff
D. could hardly accept the news that they couldn’t see the squid

[单项选择]—Are you satisfied with her answer
—Not at all. It couldn’t have been（）
A. worse
B. so bad
C. better
D. the worst

[单项选择]We may all like to consider ourselves free spirits. But a study of the traces left by 50,000 cellphone users over three months has conclusively proved that the truth is otherwise.
"We are all in one way or another boring," says Alhert-László Barabási at the Center for Complex Network Research at Northeastern University in Boston, who co-wrote the study. "Spontaneous individuals are largely absent from the population."
Barabási and colleagues used three months’ worth of data from a cellphone network to track the cellphone towers each person’s phone connected to each hour of the day, revealing their approximate location. They conclude that regardless of whether a person typically remains close to home or roams far and wide, their movements are theoretically predictable as much as 93 per cent of the time.
Surprisingly, the cellphone data showed that individuals’movements were more or less as predictable at week ends as on weekdays, suggesting that routine is rooted
A. rely much on a cellphone in life
B. can live without a cellphone
C. act without much restraint
D. are boring in some way

[简答题]Most of all , the more you know about current news , the more you will understand what is in the newspaper

[简答题]Of all human creations, language may be the most remarkable. Through language we share experiences, formulate values, exchange ideas, transmit knowledge, and sustain culture. Indeed, language is vital to thinking itself. Contrary to popular belief, language does not simply mirror reality, but helps create our sense of reality by giving meaning to events. Words are the tools of a speaker’s craft. They have special uses, just like the tools of any other profession. As a speaker, you should be aware of the meaning of words and know how to use language accurately, clearly, and vividly. Using language clearly allows listeners to grasp your meaning immediately. You can assure this by using familiar words that are known to the average person and requite no specialized background; by choosing concrete words in preference to more abstract ones; and by eliminating verbal clutter.

[单项选择]How does food affect mood and mind The answer may lie in the chemistry of the brain and nervous system. Molecules called neurotransmitters (神经传递素) are chemical messengers. They carry a nerve impulse across the gap between nerve cells. The release of neurotransmitter molecules from one neuron and their attachment to receptor sites on another keep a nerve impulse moving.
Nerve impulses carry messages from the environment to the brain, for example, the pain you feel when you stub (踢碰) your toe. They also carry messages in the other direction, from the brain to the muscles. That’s why you back away from the obstacle that initiated the pain signal and exclaim, "Ouch!"
"Many neurotransmitters are built from the foods we eat," says neuroscientist Eric Chudler of the University of Washington. Too little or too much of a particular nutrient in the diet can affect their production, Chudler says. For example, tryptophan from foods such as yogurt, milk, bananas, and egg
A. a transport vehicle
B. a protective shield
C. a power plant
D. a food factory