【題目】 This was not an easy task. The reason【1】this was difficult was that the team had limited resources. They did not have enough staff, and the laboratory in which they 【2】(work)had poor air quality. However, after hundreds of failed experiments, they eventually came across a promising chemical. It worked well in experiments on animals,【3】they had to know if it was safe for humans. Tu Youyou bravely volunteered to be the first human subject when they were ready to start testing and the rest of her team followed her.

【答案】

【1】why

【2】worked

【3】but

【解析】

這是一篇說明文。文章主要說明了屠呦呦實驗困難的原因。然而，經(jīng)過數(shù)百次失敗的實驗，他們最終發(fā)現(xiàn)了一種很有前途的化學(xué)物質(zhì)。在動物實驗中效果很好，但他們必須知道它對人類是否安全。當(dāng)他們準(zhǔn)備開始測試時，屠呦呦勇敢地自愿成為第一個人體實驗對象。

【1】

考查關(guān)系副詞。句意：這之所以困難的原因是團(tuán)隊的資源有限。結(jié)合句意表示“……的原因是……”固定句型為the reason why…is/was that…。why引導(dǎo)的定語從句。故填why。

【2】

考查動詞時態(tài)。句意：他們沒有足夠的員工，而且他們工作的實驗室空氣質(zhì)量很差。work在從句中作謂語，且根據(jù)上文They did not have enough staff可知應(yīng)用一般過去時。故填worked。

【3】

考查連詞。句意：在動物實驗中效果很好，但他們必須知道它對人類是否安全。結(jié)合上下文語境可知此處為轉(zhuǎn)折關(guān)系，應(yīng)用連詞but。故填but。

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