以下是生物体内四种有机物的组成与功能关系图，请据图回答：

(1)水稻种子细胞中，物质A是_________，物质E是指_____________。

(2)相同质量的E和F彻底氧化分解，耗氧量较多的是___________。

(3)组成物质C的共同化学元素是________。细胞中的G之所以具有多样性，其根本原因是_______。

(4)细胞中的染色体主要是由图中的__________构成（填字母代号）。

(5)噬菌体由图中的__________构成（填字母代号），当用放射性的______元素标记噬菌体时，噬菌体只有蛋白质外壳具有放射性。

The history of African—Americans during the past 400 years is traditionally narrated (1) an ongoing struggle against (2) and indifference on the part of the American mainstream, and a struggle (3) as an upward movement is (4) toward ever more justice and opportunity.

Technology in and of (5) is not at fault; it’s much too simple to say that gunpowder or agricultural machinery or fiber optics (6) been the enemy of an (7) group of people. A certain machine is put (8) work in a certain way—the purpose (9) which it was designed. The people who design the machines are not intent on unleashing chaos; they are usually trying to (10) a task more quickly, cleanly, or cheaply, (11) the imperative of innovation and efficiency that has ruled Western civilization (12) the Renaissance.

Mastery of technology is second only (13) money as the true measure of accomplishment in this country, and it is very likely that by (14) this under-representation in the technological realm, and by not questioning and examining the folkways that have (15) it, blacks are allowing. (16) to be kept out of the mainstream once again. This time, however, they will be (17) from the greatest cash engine of the twenty-first century. Inner-city blacks in particular are in danger, and the beautiful suburbs (18) ring the decay of Hartford, shed the past and learn to exist without contemplating or encountering the tragedy of the inner city.

And blacks must change as well. The ways that (19) their ancestors through captivity and coming to freedom have begun to loose their utility. If blacks (20) to survive as full participants in this society, they have to understand what works now.

16（）

A.them

B.us

C.themselves

D.ourselves