Saving money on a rain barrel purchase
Ecological considerations of rain barrels
Constructing your own rain barrels
Setting up rain barrels
第1题：
富血小板血浆制备的离心速度和时间是
A．800～1 000r／min，5min
B．2 000r／rain，5min
C．2 000r／rain。10min
D．3 000r／min，10min
E．4 000r／rain。10rain
第2题：
Passage Four
The atmosphere and oceans are not the only parts of the environment being damaged. Rain forests are being quickly destroyed as well, and their survival is questionable. E. O. Wilson, a biologist at Harvard, calls the depletion(枯竭、耗尽)of rain forest areas "the greatest extinction since the end of the age of dinosaurs(恐龙)."
Unlike some environmental issues, rain forests' depletion has fortunately received significant public and media's attention. Despite the opposition to the cutting down of rain forests, the problem continues. Every year, Brazil chops down an area of forests the size of the state of Nebraska. In addition to the Amazon's rain forests, many other forests are being cut down as well.: In Indonesia, Zaire, Papua-new Guinea, Malaysia, Burme, the Philippines, Peru, Colombia, Bolivia, and Venezuela, rain forests that were once great have been lost.
According to some estimates, 50 million acres of rain forest are cut down every year. The United Nations says the figure is closer to 17 million acres. The World Wildlife Fund says that every minute,25 to 50 acres are cut down or burnt to the ground.
The world's growing population has been a primary reason of rain forests' destruction. More people need land to live on and wood products to consume. Limiting population growth may be the first in a series of steps that would alleviate the destruction of the rain forests.
48. In the opinion of the author, ______are being destroyed terribly at present.
A. the oceans
B. the atmosphere
C. the rain forests
D. all the above
此题为细节题。从文章的第一段可以看到，作者认为现在大气层、海洋和热带雨林都面临毁灭的威胁。
第3题：
A.will
B.did
C.does
D.shall
第4题：
If it ______tomorrow, the sports meeting _____put off.
A、rains, is
B、rains, will be
C、will rain, will be
D、will rain, is
第5题：
A.absorbed
B.dropped
C.grasped
D.flooded
第6题：
《中国药典》(2005年版)规定薄膜衣片的崩解时限为（ ）。
A．5 min内
B．15 rain内
C．30 rnin内
D．60 rain内
E．120 rain内
第7题：
Why did Wilson regard "the greatest extinction since the end of the age of dinosaurs" to be the depletion of rain forest areas?
A. The writer did not give his explanation in detail.
B. The rain forests' survival is questionable.
C. It will become warmer and warmer with the depletion of rain forests.
D. Many wild animals and beasts will extinct as a result of the depletion of rain forests.
此题为推论题。在第一段的最后—句，作者提出“the greatest extinction since the end of the age of dinosaurs(恐龙)”，但在随后的段落中他并没有给出细节解释。
第8题：
A、rains, will go
B、won't rain, go
C、doesn't rain, will go
第9题：
A.Without the rain
B.Because of the rain
C.Since the rain
D.Despite the rain
答案：A
解析：题干句意为：在句子“如果不是因为这场雨，庄稼就会枯萎。”中划线部分的意思最接近（）。A选项表示“没有这场雨的话”，B、C选项都表示“因为这场雨”，C选项despite意为“尽管”，所以答案选A，“没有这场雨的话，庄稼就会枯萎。”，与题干句子意思相同。
第10题：
What can we learn from the story?
A, Comfort in traveling by t rain.
B. Pleasure of living in the country.
C. Reading gives people delight.
D. Smiles brighten people up.