第3部分：概括大意与完成句子(第23~30题，每题l分，共8分)
下面的短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第2～7段名其中4段选择1个最佳标题;(2)第27～30题要求从所给的6个选项中为每个句子确定1个最佳选项。
23. Paragraph 2_____.
24. Paragraph 3_____.
25. Paragraph 4_____.
26. Paragraph 7_____.
A. Risk of Screening to Younger Women
B. Investigating the Effect of Screening
C. Effects Predicted by Two Different Models
D. Treatment of Cancers
E. Minimizing of Radiation Exposure
F. Factors That Trigger Cancers
27. If discovered early, breast cancer may_____.
28. Medical benefits of screening the younger women are_____.
29. Advantages of screening women under 50 are_____.
30. Radiation exposure should be_____.
A. be costly
B. harmful
C. be cured
D. still open to debate
E. reduce the risk of radiation triggering a cancer
F. reduced to the minimum
