What can we learn from Para. 1 ？
A. It is impossible to prevent children from being injured.
B. A number of methods need to be proved to protect children.
C. More children died from injuries in developing countries.
D. Nobody knows that accidents don"t have to happen.
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That they were wrong in the matters______now clear to us.
A. was
B. is
C. are
D. were
非高灵敏度吸气式感烟火灾探测器不宜安装在天棚高度()m以上的场所。
A. 8
B. 12
C. 14
D. 16
______born in Chicago, the author is most famous for stories about New York City.
Although
B. Since
C. As
D. When
Only in the way______solve the problems.
A. we can
B. can we
C. would we
D. we would
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