单项选择题

In the world, there are over 2 000 varieties of snakes,（）are harmless to humans.

A. mostly they
B. most of them
C. most of which
D. which most

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I wish I（）longer this morning, but I had to get up and come to class.

A. could have slept
B. slept
C. might have slept
D. have slept
单项选择题
The water of the Great Salt Lake is（）seawater.

A. saltier than that of
B. as salty as that of
C. saltier than
D. so sally as
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