正确答案: D

经直肠前壁可触及

题目：精囊腺 （ ）

解析：D

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举一反三的答案和解析：

[单选题]下列生态因子中，对生物的作用起直接作用的是( )

温度

[单选题]Soccer, the most brilliant ____ ever created by man, boasts countless fans worldwide.

sport

[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.

which

解析：

首先判断此处缺少的是一个定语。参考上文及该句中that is这一短语可知，此处应填which一词。

[单选题]精索 （ ）

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