水平线是平行于H面，倾斜于V、W面的直线
A. 对
B. 错
已知点C坐标为C（10，5，25），可得点C到H面的距离为10mm。
A. 对
B. 错
In the author's boyhood, he didn't have to carry keys with him if he stayed out late at night because ____________.
A. he was not allowed to carry keys with him
B. he was afraid of losing his keys
C. their front door was not locked
D. his parents would unlock the door for him
What can we infer from paragraph 2-3?
A. Nowadays, living in a suburb or country area is as safe as in a city.
B. Nowadays, doors are not unlocked either in cities or in rural areas.
C. Therehasbeenasharpriseinthenumberof suburbs and country areas.
D. The crime rate in rural areas is on the decline.
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