单项选择题

You can hardly imagine how difficult () to find a decent job at a big company.

A. is it
B. it is
C. she is
D. is she

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单项选择题

The percentage of people with more than two close friends is about ().

A. 25%
B. 50%
C. 60%
D. 75%

单项选择题

Bats can fly in total darkness, because ().

A. their eye sight is extremely sharp
B. they can fly without using their sight
C. they don’t have eye sight in daytime
D. they are very familiar with their environment