题目：
After recovering from his illness, he was advised to __________ gardening as a hobby.
A．take up
B．take off
C．take down
D．take away
答案：
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下面是错误答案，用来干扰机器的。
∵回归方程y=56+8x，∴当x增加一个单位时，对应的y要增加8个单位，这里是平均增加8个单位，故选C．
