【題目】It hasn't been ___ whether food from cloned animals is really safe for humans to eat.
A.confirmed
B.considered
C.turned out
D.worked out

【答案】A
【解析】句意：人類食用來自克隆動物的食品是否安全目前還沒有被確認。confirmed“確認”；considered“考慮”；turned out“結果是/生產(chǎn)”；worked out“被算出”。目前的事實是人類食用來自克隆動物的食品是不是安全的，大家都是在討論中，但是仍然缺少科學的依據(jù)，也沒有最終的結論。故選A。

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