【題目】Scientists ______ thousands of chemicals before they decided on the right one in the end.

A. tried out B. found out

C. worked out D. turned out

【答案】A

【解析】

試題分析：句意：科學(xué)家們實(shí)驗(yàn)使用了幾千種化學(xué)物質(zhì)才最后做出正確的決定。A. tried out實(shí)驗(yàn)； B. found out查明； C. worked out解決；制定出；鍛煉； D. turned out結(jié)果是；根據(jù)句意故選A。

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