问答题

科学给我们的生活带来了许多变化。

【参考答案】

Science has brought about many changes in our lives.
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问答题
It is only when we cannot see perfectly that we realize how important our eyes are.
单项选择题
When things far away seem indistinct, one is probably ______.
A．nearsighted
B．suffering from cataracts
C．astigmatic
D．farsighted
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