单项选择题

A．Because they see different things.
B．Because they cannot agree about things.
C．Because some have better eyesight.
D．Because perceiving goes on in people’s minds.
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单项选择题
A．Light darkens silver salt.B．Light darkens natural salt.C．Light darkens silver.D．Light darkens self-developing film.
A．Light darkens silver salt.
B．Light darkens natural salt.
C．Light darkens silver.
D．Light darkens self-developing film.
单项选择题
A．Because Arab countries can’t produce so much oil.B．Because Arab countries will raise the oil price.C．Because world economy is getting worse.D．Because oil wells will run dry in 30 years at the present rate of use.
A．Because Arab countries can’t produce so much oil.
B．Because Arab countries will raise the oil price.
C．Because world economy is getting worse.
D．Because oil wells will run dry in 30 years at the present rate of use.
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