已知全集U={1，2，3，4，5}，集合M={1，2，3}，N={3，4，5}，则M∩（∁UN）=（ ）
A：{1，2}
B：{4，5}
C：{3}
D：{1，2，3，4，5}
study read work play swim
—Lily, Your task is _______ when the train will leave.
—Ok, I'll do it right away.
People in the Northwest have too many trees, so sandstorm is always coming in many parts of China in spring.
