76. In the case global warning, scientists ____.

1. tend to be more conservative than politicians
2. are in no position to offer a definite answer
3. never trust politicians as in other cases
4. feel incapable more than ever before

77. Speaking of climate change, politicians ____.

1. don't like it when scientists are indirect
2. never see eye to eye with scientists there
3. seldom want to play the game with scientists
4. are left puzzled over the formulation of policy

78. To bridge the gap between the two sides, according to the passage, scientists are supposed to ____.

1. act with more concern and enthusiasm
2. discard their prejudice towards politicians
3. be definite enough to offer informed opinions
4. do as concerned citizens do in protecting environment

79. For their part, politicians ought to be reasonable and ____.

1. pick up the right scientists for informed opinions
2. place policy and decision in the hands of scientists
3. receive reeducation in the ivory towers of academia
4. choose those who can provide a straightforward prediction

80. The author reminds those who are talking about geoengineering of ____.

1. the other alternatives in the matter
2. the climate weapon as a double-edged sword
3. the dangers of the fantasy among the reputable scientists
4. the urgency of emission reduction on the part of governments

(Reference keys.)