下列属于互利共生关系的是（ ）

【名词&注释】

禾本科植物(grass)、周期性(periodicity)、根瘤菌(rhizobia)、好莱坞(hollywood)、沉郁顿挫(profoundness and forcefulness)、诗中有画(painting-in-poetry)、豆科植物(legume)、凝血酶原(prothrombin)、解决问题。、王维山水诗(wang wei ' s landscape poetry)

[单选题]下列属于互利共生关系的是（ ）

A. 鸟与树
B. 青蛙与水稻
C. 豆科植物^(legume)与禾本科植物
D. 豆科植物^(legume)与根瘤菌

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学习资料：

[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

A. The early makers of films found Hollywood a good place for their work because of its clear, sunny, rain-free weather, which allowed pictures to be taken all the year round. Also, it was known that every kind of scene needed for films, whether town, country, sea, desert or snow-capped mountains, could be found within the area of California. Today, when most films can be "shot" (拍摄) under cover by man made lighting, these advantages (优点) are not so important.
B. In spite of a drop in its importance, Hollywood remains a center of film production although now making more films for television than for the cinema.
C. 52. David and William Horsely ______.
D. were the first to set up a film-producing workshop in Hollywood
E. discovered oil in and around Hollywood
F. followed William Selig to Hollywood and settled down there
G. turned Hollywood into a film producing center of the country

[单选题]

A. pleaseB． leave
B. great
C. breathe

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

A. illustrate the ways to repair his bicycle
B. discuss the problems of his bicycle
C. tell us how to solve a problem
D. show us how simple it is to repair a bicycle

[单选题]凝血酶原^{(prothrombin)}时间(PT)，超过正常对照多少为异常 （ ）

A. >正常对照8s
B. >正常对照3s
C. >正常对照5s ()
D. 正常对照2s
E. >正常对照10s

[单选题]王维山水诗^{(wang wei s landscape poetry)}突出的艺术特点是( )

A. 旷达飘逸
B. 慷慨雄壮
C. 沉郁顿挫
D. 诗中有画

[单选题]从弃耕地开始发展到森林的群落演替过程属于( )

A. 原生演替
B. 次生演替
C. 逆行演替
D. 周期性演替

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