英语15.He made his instruction ______ and direct so that everyone could follow easily.

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15.He made his instruction ______ and direct so that everyone could follow easily.
a.tentative b.explicit c.plausible d.informal

16.In order for a new product to sell well, manufacturers often invest a large sum of money on its _____.
a.liberation b.promotion c.destruction d.concentration

17.Since Michael was the best candidate , the committee voted _______ for him to take charge of the company’s sales department.
a.anonymously b.drastically c.customarily d.unanimously

为什么

15. b.explicit
tentative 是实验性的，plausible是可能是这么回事的意思，informal 是非正式的意思，既然他要给指令（instructions),那他一定必须明确地说明，而explicit正是这个意思

16. b.promotion
厂家希望新产品大卖，那他们一定要投资很大一笔钱（invest a large sum of money)在宣传上，而宣传正是promotion的意思。其它都不可能，liberation是自由的意思，destruction是毁灭的意思，而concerntration是集中精神的意思

17. d.unanimously
既然Michael是最好的候选人（the best candidate)，委员会的投票就应该是一致的（正是unanimously的意思）。a.anonymously（匿名的），在这里选择a没什么意思，投票本来就是匿名的。b.drastically 是不对的，既然Michael是最好的候选人投票不该是激烈的。c.customarily（惯例的）也没意思。这句话的重点在Michael是最好人选，所以投票应该是一致的。

bbb
just look them up in the didtionary,they are not grammar problems,so on one can explain them