问题 问答题

锌是人体健康所必需的元素,锌缺乏容易造成发育障碍,易患异食癖等病症,使人体免疫力功能低下.市售的葡萄糖酸锌口服液对治疗锌缺乏症具有较好的疗效.下图是某品牌葡萄糖酸锌口服液的标签,请根据标签信息回答:

(1)葡萄糖酸锌中各元素的质量比为______;

(2)葡萄糖酸锌中锌元素的质量分数为______.(精确到0.01%)

(3)某患者除正常饮食吸收锌元素外,还需服用该品牌葡萄糖酸锌口服液.若治疗一个疗程需要补充104mg锌元素,而这些锌有75%来自有该口服液,则患者共需要服用______支葡萄糖酸锌口服液?(简写出解题过程)

答案

(1)元素的质量比等于各元素原子量和的比,则有:(12×12):(1×22):(16×14):65=144:22:224:65,

故答案为:144:22:224:65

(2)某元素的质量分数等于该元素的原子量之和与相对分子质量之比,则有:

65
12×12+22+16×14+65
×100%=14.29%,

故答案为:14.29%

(3)一个疗程从口服液中获得的锌量是:104mg×75%=78mg

每支口服液含锌量是:45.5mg×14.29%=6.502mg

则需口服液78mg÷6.502mg=12支

故答案为:12支

判断题
阅读理解

Special Bridges Help Animals Cross the Road

-- Reported by Sheila Carrick

Why did the chicken cross the road? To get to the other side.

Most people know this joke. But recently, some people have been much more concerned with how the grizzly bear and mountain lion can cross the road.

Millions of animals die each year on U.S. roads, the Federal Highway Administration reports. In fact, only about 80 ocelots, an endangered wild cat, exist in the U.S. today. The main reason? Roadkill.

"Ecopassages" may help animals cross the road without being hit by cars. They are paths both over and under roads. "These ecopassages can be extremely useful, so that wildlife can avoid human conflicts," said Jodi Hilty of the Wildlife Conservation Society.

But do animals actually use the ecopassages? The answer is yes. Paul Beier of Northern Arizona University found foot marks left by mountain lions on an ecopassage that went under a highway. This showed that the lion used the passage.

Builders of some ecopassages try to make them look like a natural part of an area by planting trees on and around them. Animals seem to be catching on. Animals as different as salamanders and grizzly bears are using the bridges and underpasses.

The next time you visit a park or drive through an area with a lot of wildlife, look around. You might see an animal overpass!

小题1:The writer uses the example of “ocelots” to show that_________.

A.wild animals have become more dangerous

B.the driving conditions have improved greatly

C.the measure for protecting wildlife fails to work

D.an increasing number of animals are killed in road accidents小题2:From the news story, we know an ecopassage is_________.

A.an underground path for cars

B.a fence built for the safety of the area

C.a bridge for animals to get over a river

D.a pass for animals to cross the road小题3:When the writer says that animals seem “to be catching on”, he means_________.

A.animals begin to realize the dangers on the road

B.animals begin to learn to use ecopassages

C.animals are crossing the road in groups

D.animals are increasing in number小题4:The writer asks visitors and drivers to look around when traveling because_________.

A.wild animals may attack cars

B.wild animals may jam the road

C.they may see wild animals in the park

D.they may see wild animals on ecopassages