me tomorrow and Fll let you know the lab result.A. CallingB. CallC. To call D. Having called 题目和参考答案——青夏教育精英家教网—

题目内容

______me tomorrow and Fll let you know the lab result.

A. CallingB. CallC. To call D. Having called

【解析】

试题分析：考查动词的正确形式。句意：明天给我打电话，我会告诉你实验的结果。此句是祈使句，故用动词原形。选B。

考点：考查动词的正确形式。

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----_____.It’s a spare one.

A. Good idea B. Just go ahead C. You’re welcome D. You’d better not

Passenger pigeons（旅鸽）once flew over much of the United States in unbelievable numbers. Written accounts from the 18th and 19th centuries described flocks（群）so large that they darkened the sky for hours.

It was calculated that when its population reach its highest point, there were more than 3 billion passenger pigeons – a number equal to 24 to 40 percent of the total bird population in the United States, making it perhaps the most abundant birds in the world. Even as late as 1870 when their numbers had already become smaller, a flock believed to be 1 mile wide and 320 miles (about 515 kilometers) long was seen near Cincinnati.

Sadly, the abundance of passenger pigeons may have been their undoing. Where the birds were abundant, people believed there was an ever-lasting supply and killed them by the thousands. Commercial hunters attracted them to small clearings with grain, waited until pigeons had settled to feed, then threw large nets over them, taking hundreds at a time. The birds were shipped to large cities and sold in restaurants.

By the closing decades of the 19th century, the hardwood forests where passenger pigeons nested had been damaged by Americans’ need for wood, which scattered（驱散）the flocks and forced the birds to go farther north, where cold temperatures and spring storms contributed to their decline. Soon the great flocks were gone, never to be seen again.

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3.What was the main reason for people to kill passenger pigeons?

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1.A. raising B. teaching C. nursing D. missing

2.A. habit B. interest C. opinion D. voice

3.A. invented B. selected C. offered D. started

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7.A. history B. physics C. medicine D. law

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12.A. helped B. found C. troubled D. imagined

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14.A. put away B. taken over C. turned in D. applied for

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16.A. display B. change C. preview D. complete

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