2. 外语
  3. Research by Dr. Cameron seems to suggest that exercise can The expression "beef up" in paragraph 3 means

Research by Dr. Cameron seems to suggest that exercise can The expression "beef up" in paragraph 3 means

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问题 Research by Dr. Cameron seems to suggest that exercise can
The expression "beef up" in paragraph 3 means
选项 A、control.
B、strengthen.
C、operate.
D、encourage.
答案B
解析
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