单选题
The purpose of the author in mentioning the three researches is to ______.
A、
make a contrastive analysis of them
B、
illustrate the achievements in cancer therapy
C、
present the similarities and differences between them
D、
show how altered genes can cause cancer
【正确答案】
B
【答案解析】
[解析] 本题参阅前两题的解析。
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