题目

课外活动小组帮助校园绿化工人做花圃土壤分析，结果发现其pH小于7。而要种植的植物只适于重型土壤，为改良土壤应该选择的是 （    ）     A、烧碱      B、氯化钠     C、熟石灰       D、氯化铵 答案：CIn the past, travel was considered an essential part of education. Poets and writers realized the _41_ of travel and went out to other countries in search of _42_. A man’s education was not completed until he had visited foreign lands.That travel _43_ the mind cannot be denied. Those who travel come into _44_ with various types of people whose ways of life are completely different from theirs. They see things with their own eyes and have a better _45_ of the affairs of the world. The impressions that they receive while they travel remain _46_ in their minds for many years, and all false impression and ideas are _47_ from their minds. Thus, they are able to see things in their proper perspective（观点）and make correct judgments and decisions . And being able to make correct decisions is a valuable part of _48_.It is argued, however, that the _49_ of the great variety of books, newspaper, the radio, TV and the Internet today obviates（排除）the need for travel to acquire knowledge. But there are many things they cannot describe effectively. They have to be seen and felt. Besides, not all can understand everything that they _50_ about people away from their homes. To such people, especially, travel is an important means of education. 41. A. value  B. possibility C. background D. development42. A. work  B. wealth  C. opportunity  D. knowledge43. A. comforts  B. needs  C. uses  D. broadens44. A. sightB. contact C. powerD. effect45. A. protection  B. study C. solution  D. understanding46. A. little B. endless C. fresh   D. important47. A. removed B. tired  C. differedD. separated48. A. lifeB. travelC. education  D. society49. A. presence  B. trouble  C. importance D. discovery50. A. seeB. read  C. talk D. worry