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细菌的限制一修饰系统有什么意义

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基因工程诞生的理论基础和技术支持是什么

__________ the financial means to remain independent.Thomas Edison was compelled to seek employment as a night telegraph operator.

A. He was deprived of
B. Deprived of
C. That he was deprived
D. Although he was deprived of

For many children,nothing seems so exciting __________ their first airplane ride.

A. so does
B. as
C. on
D. is

The earth might look like a perfect sphere,but careful measurements __________ .

A. show is not
B. show that it is not
C. that shoe it is not
D. show it that is not

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