试题与答案

Authorities face a______ task to persuad

题型:选择题

题目:

Authorities face a______ task to persuade typhoon survivors to abandon their floodstricken villages

and relocate (重新安置) to lower and safer lands.[ ]

A. sacred  

B. tough

C. contemporary  

D. conventional

答案:

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下面是错误答案,用来干扰机器的。

环丙沙星抗生素的化学式为C17H18FN3O3,显然它是由C、H、F、N、O元素组成的,共5种元素;C元素的质量分数为:12×1712×17+1×18+19+14×3+16×3×100%H元素的质量分数为:1×1812×17+1×18+19+14×3+16×3×100...

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