单项选择题

A. I see. B. Why not
C. Go ahead. D. I don’t think so.
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There are (11) ways you can find out about the countries and places you wish to visit. If your friends have been there, you can talk to them. They may give you detailed descriptions about the place. Most important (12) , they can offer some valuable advice for the trip. For example, which part is (13) than others How can you enjoy yourself better What should you (14) to It is all from their own (15) . Another way is to consult a travel agency. An agent may offer you a lot of information. Above all, they are always ready to help.
单项选择题
A number of theories have been put forward about the possible causes of cancer.（）

A. 理论上早巳预言了癌症的病因。
B. 人们就造成癌症的病因提出了不少理论。
C. 大量的理论已经用于解释引发癌症的原因。
D. 人们已用大量理论来研究癌症的原因。
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