[填空题]Dr. Heinrich Applebaum holds that it isn’t the violence on TV but _______ that is doing harm to children.

[单项选择]Who isn’t at home
A. Tom.
B. Mary.
C. Jan

[单项选择]Why isn’t Helen present
A. She decided not to come.
B. She forgot to come.
C. She wasn’t invited.
D. She altered her decision.

[单项选择]一Are you suggesting that education holds the key to our future 一 ____.
A. Never mind
B. Very much so
C. All the same
D. So am I

[填空题]isn’t, hasn’t been, haven’t been, is, are, was The present government, which ______ in power long, ______ trying to control inflation. It isn’t having much success.

[单项选择]--- You needn’t take an umbrella. It isn’t going to rain. --- Well, I don’t know. It ________ do.
A. might
B. need
C. would
D. should

[单项选择]Why isn’t the man going to work
A. The boss wants him to have a rest.
B. He wants to go for a picnic.
C. He is sick and has to stay home.

[单项选择]Why isn’t the man going to the cinema
A. Because he doesn’t know where the cinema is.
B. Because he is going to see the doctor.
C. Because he doesn’t like seeing films.

[单项选择]Isn’t it surprising that scientists have a better understanding of how many stars there are in the galaxy (银河系) than how many species there are on Earth Their estimates of global species diversity vary from 2 to 100 million species. Most people agree on an estimate of somewhere near l0 million and yet only 1.75 million have actually been named. Current knowledge of species diversity is limited. This problem becomes more serious because there is a lack of a central database or list of the world’s species.
New species are still being discovered — even new birds and mammals(哺乳动物). On average, about three new species of birds are found each year, and since 1990, 10 new species of monkeys have been discovered. Other groups are still far from being completely described: an estimated 40 percent of freshwater fishes in South America have not yet been classified.
Scientists were started in 1980 by the discovery of a huge diversity of insects in tropical forests. In one study of just 1
A. Scientists have a sound knowledge about the diversity of species.
B. Scientists don’t know much about the number of stars in the galaxy.
C. Scientists show more interest in stars in the galaxy than in species on Earth.
D. Scientists don’t agree on the number of species in the world.

[填空题]The correlation between anxiety and genes isn’t 100%, and the heritability is ______.

[填空题]I know it isn’t important but I can’t help (think) ______ about it.