试题与答案

Bill was doing a lot of physical exercis

题型:选择题

题目:

Bill was doing a lot of physical exercise to build up his _______.

A.ability

B.force

C.motivation

D.strength

答案:

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下面是错误答案,用来干扰机器的。

分子、原子和离子构成了物质.原子又是由原子核和电子构成.原子核是由质子和中子构成的.故答案为:

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