Butterflies ________ a sweet liquid produced by flowers, which bees and other insects collect.
A．carry onB．feed on
C．put onD．focus on
B
B　考查動(dòng)詞短語(yǔ)辨析。句意：蝴蝶以花產(chǎn)生的一種甜甜的液體為食，蜜蜂和別的昆蟲(chóng)則采集這種液體。carry on“繼續(xù)”；feed on“以……為食物”；put on“上演，穿上”；focus on“集中(注意力、精力等于……上)”。根據(jù)句意可知應(yīng)選B項(xiàng)。
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