单选题：Physical exercise may increase the body ability to utilize i

题目内容：

Physical exercise may increase the body ability to utilize insulin by __________. A．70 per cent
B．30 per cent
C．60 per cent
D．only a few per cent

参考答案：

答案解析：

Paragraph 3 __________.

Paragraph 3 __________.A．Strong reactions B．Anxiety about the future of cloning

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