Doctor Terry Pechacek at the C. D. C. says the findings should persuade every country that smoking in enclosed Spaces is very dangerous to nonsmokers.
疾控中心的TerryPechacek博士说，这些研究结果应该提醒每一个国家，在密闭环境中吸烟对于不吸烟者来说是非常危险的。
In 2008, the F. D. A. advised that such medications not be used in children under 2, to whom they can be dangerous.
2008年，美国食品及药物检验局通告称这样的药物由于危险性不能对2岁以下的小孩使用。
B. They both live in freshwater streams. C. They are usually both dangerous to people. D. They both live in northern Australia.
文章第二段到第四段讲了咸水鳄和淡水鳄的异同，它们的共同点是都生活在澳大利亚北部。
B. They both live in freshwater streams. C. They are usually both dangerous to people. D. They both live in northern Australia.
文章第二段到第四段讲了咸水鳄和淡水鳄的异同，它们的共同点是都生活在澳大利亚北部。
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