选择题：The rescue team made every ____________ to find th

题目内容：

The rescue team made every ____________ to find the missing mountain climber.(本题1.0分)
A、 force
B、 energy
C、 effort
D、 possibility

参考答案：

Which day is knownas the Chinese Valentine’s Day?

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2已知一元钱的边际效用为3个单位，一支钢笔的边际效用为36个单位，则消费者愿意用( )来买这支钢笔。 A、 12元; B、 36元; C、 3元;