Be suspicious about water from other sources, such as ponds, streams, wells, tanks, water trucks or public standpipes.

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问题 Be suspicious about water from other sources, such as ponds, streams, wells, tanks, water trucks or public standpipes.

选项 A、brave
B、doubtful
C、quiet
D、careful

答案B

解析 suspicious“可疑、猜疑”;doubtful“怀疑”;brave“勇敢”;quiet“安静”;careful“小心”。句意:不能相信水塘、河流、水井、运水船、运水车或公共水管子的水是清洁的。
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