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【单选题】
适航水深是船舶在悬浮物中某一密度值的层面以上可以()的深度A.
正常通航
B.
安全通航
C.
一般通航
D.
设计通航
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【单选题】听力原文：New York City: The United States National Weather Service says that the huge winter storm has dumped some 68.3 centimeters of snow in Central Park, it the worst blizzard to hit New York Ci...
A.
Blizzard.
B.
Airplane crash.
C.
Heavy rain.
D.
Tsunami.
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【单选题】下列四个命题中真命题是（ ）
A.
同垂直于一直线的两条直线互相平行
B.
过空间任一点与两条异面直线都垂直的直线有且只有一条
C.
底面各边相等、侧面都是矩形的四棱柱是正四棱柱
D.
过球面上任意两点的大圆有且只有一个
【简答题】阅读理解。 What's the coolest kind of transportation (交通) for middle school students back from winter holidays? A racing bike? A car? No, it's a special kind of shoes called Heelys (暴走鞋). Heelys look just ...
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