【名词&注释】
海拔高度(altitude)、输精管(vas deferens)、射精管(ejaculatory duct)、腹股沟管(inguinal canal)
[单选题]精囊腺 （ ）
A. 为囊状不成对器官
B. 位于输精管壶腹的内侧
C. 位于膀胱底的上方
D. 经直肠前壁可触及
E. 前邻前列腺
查看答案&解析
举一反三：
[单选题]下列生态因子中，对生物的作用起直接作用的是( )
A. 温度
B. 海拔高度
C. 坡向
D. 坡度
[单选题]Soccer, the most brilliant ____ ever created by man, boasts countless fans worldwide.
A. event
B. court
C. sport
D. match
[单选题]What is the 'biggest city in the world? That is, (21) city has the largest population? This seems like (22) question to answer, but actually it isn't.It's actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn't easy to determine a city's boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it's difficult to determine what the population of a city is because it's difficult to define what a city is.
A. The second reason that it is difficult to 25 the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York's population in 1979 and an (27) of Mexico City's population in 1981. So we real ly can't compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.
B. So we can say that these are our two (29) for comparing the populations of cities: one, it's difficult to determine the (30) of a city, and two, it is difficult to get accurate information.
C. what
D. which
E. where
F. how
[单选题]精索 （ ）
A. 起于附睾尾
B. 远端连于膀胱底
C. 内含有射精管
D. 穿过腹股沟管(inguinal canal)
E. 全长可分为四部
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