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问题
单项选择题
驾驶机动车辆而不系安全带，导致翻车。这里，不系安全带的行为是一种（）。
A．风险因素
B．风险损失
C．风险载体
D．风险事故
答案
参考答案：A
解答题
解方程：
x+20%x=90
6x-
1
3
x=34
62.5%x-
1
8
=
3
8
．
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选择题
Only after the woman had her own child, _____ how difficult it was to be a mother.
A. did she realize
B. realized she
C. does she realize
D. she realized
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