问题 单项选择题 共用题干题

男性,35岁,烧伤总面积70%,Ⅲ°烧伤60%,在院外度过休克期,创面有感染,伤后4天入院,近2天来腹泻、黑粪,以往无溃疡病史。

若上消化道出血被证实,为了明确病变位置及范围,选用最佳检查方法是()

A.胃十二指肠钡餐检查

B.纤维胃镜检查

C.选择性动脉造影检查

D.CT检查

E.MRI检查

答案

参考答案:B

判断题
阅读理解

阅读理解。

     Scientists are trying to make the deserts into good land again. They want to bring water to the deserts, so

people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is

becoming desert all the time. Scientists may not be able to change the desert in time.

     Why is more and more land becoming desert? Scientists think that people make deserts. People are doing

bad things to the earth.

     Some places on the earth don't get much rain. But they still don't become deserts. This is because some

green plants are growing there. Small green plants and grass are very important to dry places. Plants don't let

the sun make the earth even drier. Plants do not let the wind blow the dirt away. When a bit of rain falls, the

plants hold the water. Without plants, the land can become desert more easily.

1. Deserts _____.

A. never have any plants or animals in them

B. can all be turned into good land before long

C. are becoming smaller and smaller

D. get very little rain

2. Small green plants are very important to dry places because _____.

A. they don't let the sun make the earth even drier

B. they don't let the wind blow the soil away

C. they hold water

D. All of the above

3. Land is becoming desert little by little because _____.

A. plants can't grow there

B. there is not enough rain

C. people haven't done what scientists wish them to do

D. scientists know little about the deserts

4. Which is the main idea of the first paragraph?

A. Scientists know how to change desert into good land.

B. Land is becoming desert faster than scientists can change it back into good land.

C. If scientists can bring water to desert, people can live and grow food there.

D. More and more places are becoming deserts all the time.