单项选择题

The accuracy of scientific observations and calculations is always ______ the scientist' s time-keeping methods.

A．at the mercy of
B．in accordance with
C．under the guidance of
D．by means of
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单项选择题
An obvious change of attitude at the top towards women' s status in society will ______ through the current law system in that country.
A．permeate
B．violate
C．probe
D．grope
单项选择题
Wireless waste from cell phones, pocket PCs, and music players ______ special problems because they have toxic chemicals in batteries and other components.
A．pose
B．commit
C．transport
D．expose
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