A:只闭合开关S1,电吹风吹出冷风
B:只闭合开关S2,电吹风吹出热风
C:同时闭合开关S1.S2,电吹风吹出冷风
D:同时闭合开关S1.S2,电吹风吹出热风
读句子,选择适当的词组完成句子。
plant trees by hand cut down one by one have to
a little fall asleep fish and chips a few praise...for