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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单项选择题
The mother didn't know who for the broken glass.
A．blamed
B．be blamed
C．to blame
D．would blame
单项选择题
By the year 2010, the earth twice as many people as it is today.
A．will have been inhabited
B．will inhabit
C．will have inhabited
D．is going to inhabit
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