第三部分：概括大意与完成句子(第23～30题，每题1分，共8分)
阅读下面这篇短文，短文后有2项测试任务：
(1)第23～26题要求从所给的6个选项中为第2～5段每段选择1个正确的小标题;
(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。请将答案涂在答题卡相应的位置上。
23 Paragraph 2__________
24 Paragraph 3__________
25 Paragraph 4__________
26 Paragraph 6__________ A Langmir and Schaefer's work for the GE Company
B Langmir and Schaefer's discovery of rain-forming
C Men's knowledge of rain-forming
E Schaefer's discovery by accident
D Schaefer's several unsuccessful experiments
F Langmir and Schaefer's successful cooperation
27 In ancient times, rainmakers tried to make rain for dry lands, but__________.
28 Schaefer found a way of how to make ice crystals__________.
29 Schaefer successfully made a field experiment on rainmaking after Planning__________.
30 Man did not succeed in making rain until quite__________. A imaginatively
B recently
C carefully
D unscientifically
E accidentally
F satisfactorily
