2. 外语
  3. A good title for this passage is ______. A number of predictions can be disproved by ______.

A good title for this passage is ______. A number of predictions can be disproved by ______.

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问题 A good title for this passage is ______.
A number of predictions can be disproved by ______.
选项 A、observations
B、experiments
C、theories
D、hypotheses
答案A
解析
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