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- 2021-11-27
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Day 17
1.晒皮肤
劝人们要晒皮肤的话去晒灯不要直接晒太阳,因为晒灯里大部分是UVA,太阳里面还有很多UVB,UVC,那些对人体有害的,问怎么削弱。
-UVA或许无害,但是妨碍人们达成晒皮肤的初衷
-有日照的地方都没有晒灯
-人们晒灯后,可能会不可避免地再次受到日光照射,过量照射诱发皮肤癌
2.乡下的小鱼场
大致是说乡下小店么离渔场又近,进价又便宜,生意上的开销和城里大店一样,但是生意依然不好,问为啥啊。
-离渔场过于近,消费者直接去渔场购买了
-乡下的居民大多都是渔民,不用买鱼
-店太小给人不新鲜的错觉,宁愿去大店买
3. Lead 会不会生病
说原来铅中毒的人很多,因为原来的水管都是铅(lead)做的。水里面含了铅,人喝了就中毒了。但是后来有人发现有些地方的人的血液里的铅含量很少。问哪一个可以解释这个问题。
认为是下面这个题:
Reviewer: The author of a recent book argues that lead contributed to many public health problems in the late nineteenth and early twentieth centuries. He claims that the main sources of this pollutant were urban water-delivery systems, which used lead pipes that leached lead into the water supply. But my own research on municipalities that used lead pipes during the period in question has shown that the inhabitants of several of them did not exhibit symptoms of lead poisoning, so the pipes are most likely not the primary culprit.
Which of the following would, if true, most weaken the reviewer's reasoning?
(A) In certain areas, exposure to hard water--water with a high mineral content--promotes the formation of a protective coating on the interior of lead pipes. |
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