Boil drinking water for at least five minutes, to kill the germs, then let it cool in a clean container. Keep it covered.

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问题 Boil drinking water for at least five minutes, to kill the germs, then let it cool in a clean container. Keep it covered.

选项 A、insects
B、bugs
C、bacteria
D、pests

答案C

解析 germ“微生物、细菌”；bacterium“细菌”；insect“昆虫”；bug“虫子，臭虫”；pest“害虫”。句意：饮用水至少要煮开5分钟，把细菌杀死，然后在容器中凉凉，盖好。

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