2014年5月托福考试模拟试题及答案(第二套)_第9页

　31. By the late twelve century, stained glass had emerged in Europe as an integral

　　A B C D

　　part of Gothic architecture.

　　32. The United States, a nation with a highly diversified economy, is a major

　　A B

　　exporter of grain, fruit, chemical, aircraft, and cars.

　　C D

　　33. Canada began cultivation wheat intensively in 1910, which led to a demand for

　　A B

　　tools, machines, housing, and building supplies.

　　C D

　　34. Magnesium has little structural strength and must be alloyed with another metals

　　A B

　　such as aluminum and zinc when it is to be subjected to stress.

　　C D

　　35. Orchid seeds take up to eighteen months to mature before they sprout, and the

　　A B

　　young plants may need another two years to reach at the flowering stage.

　　C D

　　36. The oldest public edifice in Washington D.C., the White House was originally

　　A B

　　constructed in the 1790's, also has been rebuilt or extensively remodeled

　　C

　　three times since.

　　D

　　37. Mitosis is the normal process by which a cell divides, each new cell ending up

　　A B C

　　with a same number of chromosomes as the parent cell.

　　D

　　38. There are a series of large-scale wind patterns all over Earth are called prevailing

　　A B

　　winds that have a direct effect on weather and climate.

　　C D

　　39. 1n June, 1846, near Sacramento, California, a number of new settlers rebelled in

　　A B C

　　the Bear Flag Revolt and proclaiming California an independent republic.

　　D

　　40. A mutation is result of a definite biochemical change in a gene that causes the

　　A B

　　offspring to vary in some characteristic from the parents.

　　C D