[简答题]"Mr. Bellow isn’t in at present."

[单项选择]Who isn’t at home
A. America.
B. England.
C. Australi

[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]--- 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]This exam isn't that imporant．Don't take it to heart．
A. 这次考试不那么重要，别往心里去。
B. 这次考试不是那种重要的，不要用心去记。
C. 这次考试不那么重要，不要往这里拿。
D. 这次考试不重要，别放在心里。

[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.

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

[单项选择]Why isn’t the woman going to the movie
A. ＄1,100.
B. ＄200.
C. ＄900.
D. ＄700.

[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 ______.