2. 外语
  3. The word "cards" in Line 1 refers to ______. The author’s purpose in writing the passage is to ______.

The word "cards" in Line 1 refers to ______. The author’s purpose in writing the passage is to ______.

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问题 The word "cards" in Line 1 refers to ______.
The author’s purpose in writing the passage is to ______.
选项 A、indicate the way genetic testing works
B、show the power of one’s genetic makeup
C、introduce genetic testing and its function
D、reveal the influence of environment on genes
答案C
解析
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