正确答案: D

豆科植物与根瘤菌

题目：下列属于互利共生关系的是（ ）

解析：D

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学习资料的答案和解析：

[单选题]Passage FiveHollywood (好莱坞) is a suburb of the city of Los Angeles (洛杉矶) in California. Until 1908 it was no more than a quiet village on the northern side of the city, but in that year William Selig, one of the first people to make films, set up a film-producing workshop (车间) in Los Angeles. By 1911 , David and William Horsely had set up another one in Hollywood, and at about the same time oil was discovered in the neighborhood. Thus Hollywood quickly became a big district given over to the film industry and to oil wells

followed William Selig to Hollywood and settled down there

解析：

     52．答案为C  此考题为细节题。文章第l段第2句告诉我们：William Selig于1908年建了一个电影制造车间，而从第3句By 1911，David and William Horsely had set up another one in Hollywood...中，我们就可以认定C正确。

[单选题]

great

解析：C

[单选题]By referring to Sam's broken bicycle, the author intends to ______.

tell us how to solve a problem

解析：49．以 Sam为例告诉读者如何解决问题。这也是全篇的中心。选项 C是正确的。

[单选题]凝血酶原时间(PT)，超过正常对照多少为异常 （ ）

>正常对照3s

[单选题]王维山水诗突出的艺术特点是( )

诗中有画

解析：【答案】D

[单选题]从弃耕地开始发展到森林的群落演替过程属于( )

次生演替