问题 单项选择题

关于胃壁的测量,正确的说法是()。

A.超声可显示胃壁的4层结构

B.最内层为强回声,代表黏膜层回声

C.肌层为强回声

D.浆膜层呈现为弱回声

E.胃壁厚度的平均值为6mm

答案

参考答案:B

解析:正常胃充盈后胃壁呈五层结构,三条强回声线和两条低回声线平行排列,最内层为强回声,代表黏膜层回声,胃壁厚度的平均值为4.0~4.5mm。

阅读理解

阅读理解。

     Honey (蜂蜜) from the African forest is not only a kind of natural sugar, it is also delicious. Most

people, and many animals, like eating it. However, the only way for them to get that honey is to find a

wild bees' nest (巢) and take the honey from it. Often, these nests are high up in trees, and it is difficult

to find them. In parts of Africa, though, people and animals looking for honey have a strange and

unexpected helper一a little bird called a honey guide.

     The honey guide does not actually like honey, but it does like the wax (蜂蜡) in the beehives (蜂房).

The little bird cannot reach this wax, which is deep inside the bees' nest. So, when it finds a suitable nest,

it looks for someone to help it. The honey guide gives a loud cry that attracts the attention of both passing

animals and people. Once it has their attention, it flies through the forest, waiting from time to time for the

curious animal or person as it leads them to the nest. When they finally arrive at the nest, the follower

reaches in to get at the delicious honey as the bird patiently waits and watches. Some of the honey, and

the wax, always falls to the ground, and this is when the honey guide takes its share.

     Scientists do not know why the honey guide likes eating the wax, but it is very determined in its efforts

to get it. The birds seem to be able to smell wax from a long distance away. They will quickly arrive

whenever a beekeeper is taking honey from his beehives, and will even enter churches when beeswax

candles are being lit.

1. Why is it difficult to find a wild bees' nest?

A. It's small in size.

B. It's hidden in trees.

C. It's covered with wax.

D. It's hard to recognize.

2. What do the words "the follower" in Paragraph 2 refer to?

A. A bee.                          

B. A bird.

C. A honey seeker.                    

D. A beekeeper.

3. The honey guide is special in the way____________.

A. it gets its food

B. it goes to church

C. it sings in the forest

D. it reaches into bees' nests

4. What can be the best title for the text?

A. Wild Bees

B. Wax and Honey

C. Beekeeping in Africa

D. Honey-Lover's Helper

单项选择题