[单项选择]The biggest worry that the researchers now have is _______.


A. more and more wild chimpanzees are being slaughtered
B. AIDS virus is difficult to be killed and controlled
C. it is not easy to repair people’s deficient immune systems
D. many dangerous viruses are being transmitted to humans

[单项选择]The biggest worry that the researchers now have is ______.


A. more and more wild chimpanzees are being slaughtered.
B. AIDS virus is diificult to be killed and controlled.
C. it is not easy to repair people’s deficient immune systems.
D. many dangerous viruses are being transmitted to humans.

[单项选择]Some researchers have undertaken some psychological studies which prove that many children develop fears of ______ dangers.
A. imagination
B. imaginary
C. imaginable
D. imaginative

[单项选择]Researchers have found in an initial study on six patients that electrical deep brain stimulation can dramatically________ depression that is resistant to other treatments.


A. aggravate
B. alleviate
C. aggregate
D. affiliate

[单项选择]

Text 2
For a long time, researchers have tried to nail down just what shapes us--or what, at least, shapes us most. And over the years, they’ve had a lot of finding moments. First it was our parents, particularly our mothers. Then it was our genes. Next it was our peers, who show up last but hold great sway. And all those ideas were good ones--but only as far as they went.
The fact is once investigators had exposed all the data from those theories, they still came away with as many questions as answers. Somewhere, there was a sort of temperamental dark matter exerting an invisible gravitational pull of its own. More and more, scientists are concluding that this un explained force is our siblings.
From the time they are born, our brothers and sisters are our collaborators and coconspirators, our role models and cautionary tales. They are our scolds, protectors, goads, tormentors, playmates, counselors, sources of envy, objects of pride. They te
A. siblings are not in the range of scientific research.
B. people learned management skills from family playroom.
C. spouses learned negotiation skills from their sisters and brothers.
D. studies on siblings are on their way.

[单项选择]Don't worry , the children are now old enough to ______ themselves.


A. look round
B. look after
C. look for

[单项选择]Which is now the second biggest company in the United States


A. General Electric.
B. Intel.
C. Cisco Systems.
D. GE Capital Services.

[单项选择]Don't worry. The children are now old enough to ______ themselves.


A. look round
B. look after
C. look for

[单项选择]Larry does not have to worry about his newly-bought car, because he has______ it against accident, theft and fire.
A. assured
B. secured
C. ensured
D. insured

[单项选择]The students have too much worry because ______.

[单项选择]Now scientists have found in the past few years _________.


A. the exposure of DNA to the public is unnecessary
B. the tiny cell in DNA is a neat little machine
C. man knows nothing about DNA
D. man has much to learn about DNA

[单项选择]All of the plants now raised on farms, have been developed from plants （）wild.
A. once they grew
B. they grew once
C. that once grew
D. once grew

[单项选择]You have been sitting on my hat and now it is badly out of ______.
A. date
B. shape
C. order
D. balance

[单项选择]The main problem right now is（）I have enough time.
A. that
B. whether
C. if
D. which

[单项选择]Until now we have ______many improvements in women's employment.


A. brought out
B. brought up
C. brought forward
D. brought about