Badweatherpreventedthework____intime. [

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问题选择题

Bad weather prevented the work ____ in time. [ ]

A. completed

B. from completing

C. to be completed

D. being completed

答案

答案：D

选择题

Those students argued ________each other ________whether the research into human cloning should be carried out.[ ]

A. for; over

B. to; about

C. of; over

D. with; about

单项选择题

在色谱过程中，混合物所含两组分的分配系数(K)或容量因子(k)不等时，被流动相携带移动的速度就不等，这种现象称为()

A．差速迁移

B．分配差异

C．容量因子(k)差异

D．比移值差异

E．分离度(R)差异