题干

1998年长江中下游发生特大洪灾,其主要原因之一是(  )

A:北方风沙使河床变浅

B:长江口发生热带风暴

C:水库泄洪过快

D:长江上游森林植被遭到破坏

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答案(点此获取答案解析)

D

同类题1

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    I do think that dieting does not work. What it does do is to make you uneasy about food. Imagine you are prepared to abandon your belief and imagine yourself like a slim person...how do you get there?

Transform your focus

    ____Focus on what you really want, not what you don't want. Imagine how you would like to be. See a big picture of yourself, looking fantastic in your bathing suit, how good would you be feeling?____

Understand your hunger

    Slim people eat based on how hungry they are and when lunch time or tea time or dinner time around; they don't just fill up their plate because the food is there. The next time hunger pangs (剧痛) strike, imagine you have a scale in your mind from one to ten. ____Check where you are on that scale before you put something into your mouth. You can also use the scale to judge how full you're getting.

    ____

    Hunger is the only good reason for eating. Most overweight people have got into the habit of eating    when they are not hungry. ____Many people have forgotten how to eat when they're hungry and most    diets tell you to ignore pleasure and ignore hunger and they also tell you when/how much and exactly what to eat.

A. Recognize real hunger

B. Don't watch TV or read books while eating.

C. One means you're starving; ten means you're not hungry.

D. Slim people eat based on how hungry they feel before a meal.

E. Exercise is an efficient way of losing weight.

F. Start by believing in yourself as a slim person.

G. Get that great confident feeling by creating how you would like to be.

同类题3

阅读理解

    I was working the overnight shift in a remote hospital in the Rocky Mountains. Late in the evening, a young African teenager was brought into the emergency department. He lived at sea level and had never been in the mountains. After skiing all day, he felt really ill. Everyone assumed it was altitude sickness.

    He was sweating and had abdominal (腹部的) pain. His heart rate increased. We sent off his lab work, and his blood sugar came back at almost 600 — normal is less than 100. His platelets (血小板), necessary for stopping bleeding, came in at 10,000; they should have been over 150,000. I did an ultrasound of his abdomen, and it looked like his belly was full of blood. This wasn't altitude sickness. And in the short time I'd been trying to figure out what was wrong, he was getting sicker. The friends he was traveling with were terrified, and rightly so.

    The mystery was finally solved with an old-fashioned microscope. When we looked at his blood, we saw some sickled (镰形的) red blood cells. That's how we were able to diagnose sickle cell trait. If you have sickle cell trait — which means you got the sickle cell gene from just one parent instead of two — you have no symptoms at low altitude, but high altitude can sometimes cause the red blood cells to turn into sickle shapes and take oxygen from vital organs. This teenager didn't know he had it, but the effect of the altitude on his blood cells was so extreme that after just a short time in the mountains, he suffered great pain.

    He needed platelets immediately, but we didn't have enough at the remote hospital. And there was a snowstorm, so the medical helicopters couldn't fly. It was a scary night. Just as we were abandoning all hope, we met an ambulance that drove halfway up from the city with blood products and transferred him to the city hospital for emergency surgery. The story has a happy ending: He recovered fully.