单项选择题

I always ______ the length of time I'll take to do something; therefore, no plan is accomplished yet.

A．esteem
B．underestimate
C．underlie
D．estimate
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Living in the central Australian desert has its problems, ______ obtaining water is not the least.
A．of which
B．for what
C．as
D．whose
单项选择题
Part of the lake has been polluted. You can see the water is covered with ______ oil.
A．a coat of
B．a story of
C．a film of
D．a pad of
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