Anyone’s response to attempts to treat his or her headache is so variable. The reassurance of a placebo may be very effective in

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问题 Anyone’s response to attempts to treat his or her headache is so variable. The reassurance of a placebo may be very effective in one person and useless in another.

选项 A、flexible
B、fixed
C、various
D、changeable

答案D

解析 variable可变的。
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