单项选择题

A．They devote a lot of time to theoretical problems.
B．They spend most of their time looking through telescopes.
C．They are constantly analyzing data.
D．They often live near observatories.
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单项选择题
A．Because it was too heavy.B．Because it did not bend easily.C．Because it did not shoot far.D．Because its string was short.
A．Because it was too heavy.
B．Because it did not bend easily.
C．Because it did not shoot far.
D．Because its string was short.
填空题
Compared with the rare school killings, children are more likely to be killed in the streets or in their homes because of ______ that begun in the mid-1980s.
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