皮皮学,免费搜题
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21___________Anything higher than SPF 50+ can tempt you to stay in the sun too long. Even if you don’t burn, your skin may be damaged. Stick to SPFs between 15 and 50+. Pick a product based on your own skin color, time outside, shade and cloud cover. News about vitamin A. Eating vitamin A –rich vegetables is good for you, but spreading vitamin A on your skin may not be. Government data shows that cancers develop sooner on skin coated with creams with vitamin A . 22___________ Pick a good sunscreen. EWG ’s sunscreen database rates the safety and effect of about 1,400 SPF-rated products, including about 750 sunscreens for beaches and sports use. We give high ratings to brands that provide broad-range, long- lasting protection with ingredients that pose fewer health concerns when absorbed by the body. 23___________Cream, because sprays cloud the air with tiny particles that may not be safe to breathe. Reapply cream often. Sunscreen chemicals sometimes degrade in the sun, wash off or rub off on towels and clothing. 24___________ The FAD treats powdered sunscreens as unapproved new drugs and may take enforcement action against companies that sell them-except for small businesses, which can sell powders until December 2013. 25___________ Wear sunscreen. In 2009, nearly twice as many American men died form. skin cancers as women. Surveys show that 34 percent of men wear sunscreens, compared to 78 percent of women. Got your vitamin D? Many people don ’t get enough vitamin D, a hormone manufactured by the skin in the presence of sunlight. Your doctor can test your level and recommend supplements if you are low in this vital nutrient. A.No powder! B.Avoid midday sun. C.Message for men: D.Cream or spray? E.Don’t fall for high SPF labels. F.Take special precautions with infants and children. G.Avoid any sun product whose label says vitamin A. 21选() 22选() 24选() 23选() 25选()
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举一反三
【简答题】v. last or continue for a long time; take a long time to leave or disappear
【简答题】英译汉英:disappear v.,汉:______。
【判断题】化学腐蚀的特点是只有单纯的化学反应,其产物生成于发生反应的金属。()
A.
正确
B.
错误
【简答题】v. to take a long time to leave or disappear
【简答题】v. lose color or brightness; disappear slowly
【单选题】对于伴有化学反应的扩散,由于整个过程中,既有分子扩散,又有化学反应,这两种过程的相对速率极大地影响这过程的性质,当化学反应的速率大大慢于扩散速率时,( )决定过程的速率。
A.
化学反应
B.
扩散
C.
化学反应和扩散
D.
化学反应和扩散都不
【单选题】工程机械电源通常用的是()。
A.
6V
B.
24V
C.
380V
D.
220V
【单选题】disappear v.
A.
出现
B.
消失
C.
表现
【简答题】燃烧过程中,如果化学反应速度快于氧气的扩散速度,此时燃烧速度取决于______。
【判断题】分步进行的化学反应,总反应速率主要取决于最快一步的反应速率。(    )
A.
正确
B.
错误