_________ in drinking water have spread the illness.
（A）Barriers
（B）Bacteria
（C）Barn
（D）Bark
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更多雅思试题
- 1The _______ of the house is beautifully painted.
- 2Lions and house cats evolved from a common _______.
- 3I certainly didn’t intend to _____ your plans.
- 4Rock music usually ____ the young people in most countries.
- 5I didn’t know where to send this _______ letter.
- 6I am a new _______.I was hired yesterday.
