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In area, Montana is the fourth largest state in the United States,---- it ranks forty-fourth in population.

A. nor
B. in spite of
C. how
D. but

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Although rain falls throughout most of the world, in Antarctica, and in a few other places, -------precipitation occurs as ice and snow.

A. and all
B. all
C. where all
D. it is all

北京2008年火炬接力是现代奥运史上路线最长、范围最广、参与人数最多的接力活动。()

A. 对
B. 错

以下关于最多或最少的计算正确的是( )。

A. 显微镜下观察同等直径的单行排列细胞,如果放大50倍时最多可看到20个完整的细胞,放大100倍时,最多可看到40个完整的细胞
B. 正常情况下,玉米(2n=20)细胞内染色体数最多可为60条
C. 120个碱基组成的人体DNA分子片段,其种类最多可达4120
D. 如果草原上生产者所接受照射的总光能为a,那么次级消费者所获能量最多是0.04a

Inertial navigation,---- a vital role in space exploration, employs devices called accelerometers to measure accelerations of spacecraft.

A. it plays
B. which plays
C. which it plays
D. in which plays

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