[填空题]All these difficulties were caused by (nature)______disasters.

[填空题]All these difficulties were caused by (nature)______disasters.

[单项选择]（　） are afraid of difficulties, we are all determined.
A. None of us
B. Not all of us
C. All of us
D. All of us not

[单项选择]What caused all the trouble
A. A storm.
B. A car accident.
C. A driver driving too fast.
D. A flood.

[单项选择]We were all there when the accident occurred.
A. happened
B. broke
C. spread
D. appeared

[单项选择]A. The products were all made from fresh vegetables and fruits.
B. The homemade products were actually made in the factory.
C. The factory was equipped with the most sophisticated machinery.
D. There were homemade fresh vegetables and fruits in the factory.

[填空题]

If good intentions and good ideas were all it took to save the deteriorating atmosphere, the planet’s fragile layer of air would be as good as fixed. The two great dangers threatening the blanket of gases that nurtures and protects life on earth-global warming and the thinning ozone layer--have been identified. Better yet, scientists and policymakers have come up with effective though expensive countermeasures.
(2)
41._________________.
(3) CFCs-first fingered as dangerous in the 1970s by Sherwood Rowland and Mario M01ina, two of this year’s Nobel-prizewinning chemists--have been widely used for refrigeration and other purposes.
(4) If uncontrolled, the CFC assault on the ozone layer could increase the amount of hazardous solar ultraviolet light that reaches the earth’s surface, which would, among other things, damage crops and bring disasters to environment.
(5) Thanks to a sense of urgency triggered by the 1985 detection