Doyoudrinkwaterthat'sbeenleftsittingoutovernightoreve...
问题详情:
Do you drink water that's been left sitting out overnight or even for another day Have you noticed it tastes different Tap water that has been left to sit out slowly begins to acquire an off taste. Many people think that this is because of microorganisms(微生物). But that's not what makes old water taste not fresh. For that we can thank carbon dioxide. After about 12 hours, tap water starts to go flat as carbon dioxide in the air starts to mix with the water in the glass, lowering its pH and giving it an off taste. But it's most likely safe to drink. However, back to those microorganisms. If you use a dirty glass day after day, there is more of a chance of bacteria making themselves known; a risk that increases if you share the glass with another mouth as well. But assuming you use a fresh glass every few days, you probably won't have a problem unless the glass has been touched by dirty fingers, and especially if those dirty fingers went unwashed after using the bathroom. As for plastic water bottles that have been left out in the sun or in the car, step away from the bottle, warns Dr. Kellogg Schwab, director of the Johns Hopkins University Water Institute. "A chemical called bisphenol-A, or BPA, along with other things used to make plastic can leach(过滤) into your water if the bottle heats up or sits in the sun," he explains. BPA, as you probably know, has been linked to everything from heart disease to cancer. Schwab also adds that plastic used for commercial bottled water isn't meant to be washed or refilled, so use only one time and recycle. Or don't buy them at all; use refillable water bottles instead. 32. Tap water begin to acquire an off taste because of . A. BPA B. the glass C. the microorganism D. carbon dioxide 33. According to Paragragh 2 , tap water that's been left sitting out for 12 hours____. A. tastes better B. is still safe to drink C. contains few microorganisms D. is most likely undrinkable 34. What should we do with plastic water bottles that have been left out in the sun or in the car A. Throw them away. B. Refill them with fresh water. C. Use them after they cool down. D. Clean them and use them again. 35. Which of the following is true about BPA A. It is safe for people to use. B. It is a kind of new material. C. It can cause great harm to people. D. It is the main material to make plastic.
【回答】
DBAC
知识点:阅读理解
题型:阅读理解
-
下列化学用语正确的是A.CH4分子的球棍模型: B.乙烯的结构简式:CH2CH2 C.*...
问题详情:下列化学用语正确的是A.CH4分子的球棍模型: B.乙烯的结构简式:CH2CH2 C.*化*的分子式:NaCl D.K+的结构示意图:【回答】A知识点:物质结构元素周期律题型:选择题...
-
下列说法正确的是:( )A.1molN2的质量是14g B.H2SO4的摩尔质量是98gC.H...
问题详情:下列说法正确的是:( )A.1molN2的质量是14g B.H2SO4的摩尔质量是98gC.H2O的摩尔质量是18g/mol D.1molHCl的质量是36.5g/mol【回答】C知识点:物质的量单元测试题型:选择题...
-
下列化学用语表达正确的是( )A.羟基的电子式 B.乙烯的结构简式是CH2CH2C.醛基的结...
问题详情:下列化学用语表达正确的是()A.羟基的电子式 B.乙烯的结构简式是CH2CH2C.醛基的结构简式是—COH D.淀粉的分子式是(C6H10O5)n【回答】D知识点:糖类油脂蛋白质单元测试题型:选择题...
-
我国现存最早的数学名著是A.《九章算术》 B.《缀术》 C.《大明历》 ...
问题详情:我国现存最早的数学名著是A.《九章算术》 B.《缀术》 C.《大明历》 D.《水经注》【回答】A知识点:大河流域人类文明的摇篮题型:选择题...
相关文章
- —Jessie,don'tyouthinkitexcitingtoskateonthefrozenrivern...
- Doyoudrinkwaterthat'sbeenleftsittingoutovernightoreve...
- Doyoudrinkwaterthat'sbeenleftsittingoutovernightorevenf...
- Doyoudrinkwaterthat'sbeenleftsittingoutovernightoreve...
- 任务型阅读Doyouneedusefulandinterestingbooks?Herewe'vegotple...
- It'slateeveninginthemiddleofthewinter.Thesnowisdeep,but...
- 七选五阅读There'splentyofadviceoutthereaboutwhattodotogettos...
- Doyoudrinkwaterthat'sbeenleftsittingoutovernightoreve...
- ---Thestudentslookverytiredafterthesportsmeeting.---We...
- Doyoudrinkwaterthat'sbeenleftsittingoutovernightoreve...