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更新 2022-09-03
科目英语
题型单选题
难度中等
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Los Angeles Times reported that researchers may have found a way to _________ human life by changing certain genes, so that humans might expect to live twice as long.

A．extend	B．preserve
C．multiply	D．transform

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相关试题

They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.

A．which; that

B．it; one

C．that; one

D．one; that

题型：未知
难度：未知

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They find themselves surrounded by colorful rocks, fishes, seashells and plants, all ____ slowly in the blue water.

A．waving and moving	B．waved and moved
C．waved and moving	D．waving and moved

题型：未知
难度：未知

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Even though the pure water is ____ gives sea water its main properties, the salinity of sea water affects both its weight and freezing point.

A．the one

B．which

C．what

D．that

题型：未知
难度：未知

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Mike is Mrs.’ pet student, ____ all her students no one else is as nice as he.

A．because

B．because of

C．with

D．as

题型：未知
难度：未知

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He came running along and climbed ____ the train just as it was about to leave.

A．aboard

B．board

C．abroad

D．on abroad

题型：未知
难度：未知

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