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【单选题】
Which of the following statements is true of the vocal cords?
A.
In male s the vocal cords are typically longer than in female s.
B.
In male s the vocal cords are typically shorter than in female s.
C.
In male s the vocal cords are typically thinner than in female s.
D.
The vocal cords in both male and female s are of the same lengt
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参考解析：
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【单选题】拟在8度烈度场地建一桥墩，基础埋深2.0m，场地覆盖土层厚20m，地质年代均为Q4，地表下为5.0m的新近沉积非液化黏性土层，其下为15m的松散粉砂，地下水埋深dw＝5.0m，按《公路工程抗震设计规范》(JTJ 004—89)说明本场地地表下20m范围土体各点σ0/σe的变化情况，下述说法正确的是( )。
A.
从地面往下二者之比随深度的增加而不断增加
B.
从地面往下二者之比随深度的增加而不断减少
C.
从地面5m以下二者之比随深度增加而不断增加
D.
从地面5m以下二者之比随深度增加而不断减少
【单选题】父亲把所有财物平均分成若干份后全部分给儿子们，其规则是长子拿一份财物和剩下的十分之一，次子拿两份财物和剩下的十分之一，三儿子拿三份财物和剩下的十分之一，以此类推，结果所有儿子拿到的财物都一样多，请问父亲一共有几个儿子?( )
A.
6
B.
8
C.
9
D.
10
【单选题】What is this lecture mainly about?
A.
A process for improving drainage systems
B.
A comparison of different types of drainage systems
C.
The relationship among the most common drainage systems
D.
The changes that occur in drainage systems over time
【单选题】The intellectually______enterprise of science depends on free communication.
A.
depressing
B.
depressed
C.
exhilarating
D.
exhilarated