问题 解答题

据有关报道,广东省英德市某村大多数人寿命不过40岁.该省地质调查院得知后,开展了粤北岩溶地下水资源勘察与生态环境地质调查.发现因地势低洼,污水渗入地下,污染了地下水资源,以致地下水锰含量每升高达0.65毫克,亚硝酸盐含量每升达0.15毫克,分别超过了国家生活饮用水卫生标准规定的6.5倍和30倍.由于长期循环使用污染水,当地人的健康与生活受到严重影响.可见,人类的活动会影响环境,而环境的变化又影响着人类自身的生存和发展.请结合本地生态环境、生产或生活实际状况作答:

(1)举一个人类活动破坏生态环境的实例.

(2)针对该例提出一个探究性问题.

(3)用已有知识作出假设.

(4)说出探究问题的方法.

(5)提出解决问题的建议.

答案

(1)森林、植被被当地人们砍伐和破坏.;草原过度放牧,沙尘暴危害严重;大量捕杀野生动物;大量使用农药、化肥污染环境等.

(2)提出问题:植被的减少会增加水土流失吗?

(3)作出假设:植被的减少会增加水土流失.

(对提出问题作出肯定或否定的回答)

(4)在难以直接拿研究对象做实验时,有时用模型来做实验,或者模仿实验的某些条件进行实验,叫模拟实验.可用用模拟实验的方法来验证植被的减少会增加水土流失.

(5)植树造林;退耕还林、还草;大力宣传增强人们保护植被的意识;等等.

故答案为:(1)森林、植被被当地人们砍伐和破坏.

(2)植被的减少会增加水土流失吗?

(3)植被的减少会增加水土流失.

(4)用模拟实验的方法.

(5)植树造林;退耕还林、还草;大力宣传增强人们保护植被的意识;等等.

多项选择题
填空题

For years pediatricians didn’t worry much about treating hypertension in their patients. After all, kids grow so fast, it’s hard keeping up with their shoes size, let alone their blood pressure. Sure, hypertension in adults places them at greater risk of heart attack and stroke. But nobody likes the idea of starting youngsters on blood-pressure medicine they could wind up taking the rest of their lives. Who knows what previously unheard-of side effects could crop up after five or six decades of daily use

The rationale has been: kids grow out of so many things; maybe they’ll grow out of this too.

41.Now, though, comes word that high blood pressure can be destructive even in childhood.

42.Who is most at risk

Boys are more than girls, especially boys who are overweight. Their heart works so hard to force blood through extra layers of fat that its walls grow denser. Then, after decades of straining, it grows too big to pump blood very well.

43.How can you tell if yours are like the 670,000 American children ages 10 to 18 with high blood pressure

It’s not the sort of thing you can catch by putting your child’s arm in a cuff at the free monitoring station in your local grocery. You should have a test done by a doctor, who will consult special tables that indicate the normal range of blood pressure for a particular child’s age, height and sex.

44.About half the cases of hypertension stem directly from kids being overweight.

45.How can you do

You can keep your children from joining their ranks by clearing the junk food from your pantry and hooking you kids — the earlier the better — on healthy, attractive snakes like fruits (try freezing some grapes/or carrot sticks with salsa. ) Not only will they lower your children’s blood pressure: These foods will also boost their immune system and unclog their plumbing.

[A] And the problem is likely to grow. Over the past 30 years the proportion of children in the U. S. who are overweight has doubled, from 5% to 11% or 4.7 million kids.

[B] According to a recent report in the journal Circulation, 19 of 30 children with high blood pressure developed a dangerous thickening of the heart muscle that, in adults at least, has been linked to heart failure. “No one knows if this pattern holds true for younger patients as well, ” says Dr. Stephen Daniels, a pediatric cardiologist who led the study at Children’s Hospital Medical Center in Cincinnati, Ohio. “But it’s worrisome. ”

[C] Feed your children nutritious foods three times a day to keep his immune system healthy. Make sure the meals include all the food groups to ensure they are getting plenty of vitamins.

[D] Fortunately the abnormal thickening can be spotted by ultrasound. And in most case, getting that blood pressure under control — through weight loss and exercise or, as a last resort, drug treatment — allows the overworked muscle to shrink to normal size.

[E] If the doctor finds an abnormal result he will repeat the test over a period of months to make sure the reading isn’t a fake. He’ll also check, whether other conditions, like kidney disease, could be the source of the trouble, because hypertension is hard to be detected. The National Heart, Lung and Blood Institute recommends annual blood-pressure checks for every child over age 3.

[F] High blood pressure isn’t just an issue for adults; keeping kids blood pressure levels in a healthy range is also important. In a new study reported in Hypertension, researchers found that increased exercise duration among kids leads to lower blood pressure levels, however the same cannot be said for increased intensity.

[G] Meanwhile, make sure your kids spend more time on the playground than with their PlayStation. Even if they don’t shed a pound, vigorous exercise will help keep their blood vessels nice and wide, lowering their blood pressure. And of course, they’ll be more likely to eat light and, exercise if you set a good example.

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