单项选择题

It is prudent to keep your child within ______ when shopping.

A．distance
B．reach
C．bound
D．safety
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单项选择题
Which of the following does NOT help to separate the useful U-235 and nearly useless U~2387
A．The principle of gaseous diffusion.
B．A process involving magnetic separation of the two isotopes.
C．A process nearly identical in the chemical makeup.
D．A gas centrifuge.
单项选择题
What is the woman’s response
A．She doesn’t know its intention.
B．She can’t understand the report.
C．She doesn’t think much of the report.
D．She doesn’t believe the exact figures in it.
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