几道英文题目.求讲解.每题3分.

几道英文题目.求讲解.每题3分.
13. ____ is rooted in experiments in iron and steel conducted in the nineteenth century.
(A) While the history of twentieth-century architecture
(B) The history of twentieth-century architecture
(C) That the history of twentieth-century architecture
(D) Both twentieth-century architecture and its history
B OR C?WHY?
、以下是改错题,我照答案把有错误的地方用【】起来了,请问该如何改正呢.
18. The ability to talk is one of the 【skill】 that make humans different from the rest of the animal world.
20. Polar bears are bowlegged and pigeon-toed, adaptations that enable 【this】 massive animals to maintain their balance as they walk.
23. The first fiction writer in the United States to achieve international fame was Washington Irving, who wrote many stories, 【included】 “ Rip Van Winkle” and
“The Legend of Sleepy Hollow”.
25. For each enzyme reaction there is an optimum 【temperature which】 maximum efficiency is achieved.
28. Colonial efforts to manufacture glass at Jamestown---- and later attempts near Philadelphia and Boston---failed despite the 【abundant】 of fuel and good raw
materials.
30. Chicago is the third largest publishing center in the United States,【 exceeding】 only by New York City and San Francisco.
33. Water is the only substance that【 occur】 at ordinary temperatures in all three states of matter: solid, liquid and gas.
34. Despite the growth of manufacturing and other industries, the economy of the state of Texas has remained heavily 【dependence】 on oil and gas.
37.Charles Bullfinch was the architect who 【design】 the original red brick core of the State House in Boston.
39. Lowell, Massachusetts, known as the “Spindle City” since 1822 when its first textile mills were built, attracted worldwide attention 【as textile】 center