2．In time when there wasn't enough food，some peoplefed on（以…為食） leaves．

分析 在沒(méi)有足夠的食物的時(shí)候，有些人以樹葉為食．

解答 答案：fed on 根據(jù)題干In time when there wasn't enough food，some people___（以…為食） leaves．可知句意為：在沒(méi)有足夠的食物的時(shí)候，有些人以樹葉為食．根據(jù)In time when there wasn't enough food，是一般過(guò)去時(shí)態(tài)，是說(shuō)過(guò)去發(fā)生的事情．可知下文也應(yīng)該是一般過(guò)去時(shí)態(tài)．feed on，以…為食，動(dòng)詞短語(yǔ)．feed，過(guò)去式為fed．故填：fed on．

點(diǎn)評(píng) 主要考查學(xué)生"識(shí)詞、記詞和用詞"的能力．這類試題體現(xiàn)了"詞不離句"的特點(diǎn)，要求學(xué)生注意單詞在句子中的確切含義與正確形式，而不是孤立地死記硬背單詞．本題主要考查feed on，以…為食，動(dòng)詞短語(yǔ)．

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