单项选择题

If you work for a major corporation, or are contracted at one, sooner or later, you may be called upon to create or maintain an internal website. Here are the ______ of intranets.

A. ins and outs
B. in a pinch
C. in a cleft stick
D. in a breeze

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单项选择题

The passage is developed primarily by （）

A. testing the evidence supporting a theory
B. describing causes and effects of events
C. weighing the pros and cons of a plan
D. projecting the future consequences of a decision

单项选择题

These national parks are very important for preserving many animals, who would otherwise nm the risk of becoming（）

A. abolished
B. extinct
C. distinct
D. distinctive