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1 billion worldwide who live with unsafe drinking water.
2019年12月四级真题(第二套)阅读 Section A
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About a million bottles are bought every minute, not only by thirsty tourists but also by many of the 2.1 billion worldwide who live with unsafe drinking water.
2019年12月四级真题(第二套)阅读 Section A
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It turned out that, when the mice were hungry, they ventured into the unsafe areas for food.
2018年6月四级真题(第二套)听力 Section C
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Twelve regions were listed as unsafe on Wednesday, on Thursday, eight remained.
2019年12月四级真题(第二套)阅读 Section B