2. 外语
  3. The word "it" in line 3 refers to In paragraph 3, the author makes which of the following statements about a species’survival?

The word "it" in line 3 refers to In paragraph 3, the author makes which of the following statements about a species’survival?

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问题  The word "it" in line 3 refers to
  In paragraph 3, the author makes which of the following statements about a species’survival?
选项 A、It reflects the interrelationship of may species.
B、It may depend on chance events.
C、It does not vary greatly from species to species
D、It is associated with astronomical conditions.
答案B
解析
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