如图所示，两艘飞船A、B沿同一直线同向飞行，相对地面的速度均为v(v接近光速c)

An Indian anthropologist, Chandra Thapar, made a study of foreign cultures, which had customs similar to (91) of his native land. One culture in (92) fascinated him because it reveres one animal (93) sacred, much as the people in India (94) the cow. The things he discovered might interest you (95) you will be studying India as part of this course.
The tribe Dr. Thapar (96) is called the Asu and is found on the American continent north of the Tamhumara of Mexico. Though it seems to be a (97) developed society of its type, it has an overwhelming (98) with the care and feeding of the rac—an animal much like a bull in size, strength and temperament. In the Asu tribe, it is almost a social (99) to own at least one (100) not more rats. People not possessing at least one are (101) in low esteem by the community because they are too poor to (102) one of these beasts properly. Some members of the tribe, to (103) their wealth and social prestige, even own (104) of racs.
(105) the rac breed is not very healthy and usually does not live more than five to seven years. Each family invests large (106) of money each year to keep its rac healthy and shod, for it has a tendency to throw its shoes often. There are rac (107) in each community, perhaps more than one if the community is particularly (108) . These specialists, however, due to the long period of ritual training they must undergo and (109) the difficulty of obtaining the right selection of charms to treat the rac, demand (110) offerings whenever a family must treat an ailing rac.

A．for

B．as

C．is

D．of

塑料是以（）为主要成分，再加入一些用来改善其使用性能和工艺性能的添加剂，在一定温度、压力下加工塑制成的材料。

A．合成树脂

B．合成橡胶

C．合成纤维

D．合成乙烯

通信企业建立客户管理系统，包括（）。

A.客户服务过程管理

B.客户服务人员管理

C.客户服务流程管理

D.客户服务结果监管

E.客户服务进度管理

The scientists approached the pandas quietly and watched them. The underlined part means ____. [ ]

A. left behind

B. ran quickly to

C. went off

D. came near to

某分项工程实物工程量为22000m³，该分项工程人工产量定额为55m³/工日，计划每天安排2班、每班10人完成该分项工程，则其持续时间为( )天。

A．10
B．20
C．40
D．55