单项选择题

One sign (by which ) you are making progress in (an art) such as painting or photography is (that) you begin to realize how much (there is) to learn.

A．by which
B．an at
C．that
D．there is
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单项选择题
The English weather defies forecast and hence is a source of interest and __________ to everyone.
A．speculation
B．attribution
C．utilization
D．proposition
单项选择题
France's ___________ of nuclear testing in the South Pacific last month triggered political debates and mass demonstrations.
A．assumption
B．consumption
C．presumption
D．resumption
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