问题 单项选择题

不能引起促胃液素分泌的是

A.HCl灌注刺激幽门部黏膜
B.肉汤灌注刺激幽门部黏膜
C.扩张刺激幽门部黏膜
D.刺激支配幽门部迷走神经

答案

参考答案:A

解析:当胃窦pH降至≤2.0时,胃内的 HCl直接作用于壁细胞,或通过抑制G细胞释放促胃液素和刺激D细胞释放生长抑素,都可抑制胃酸分泌。通过这种负反馈机制,有助于防止胃酸过度分泌,保护胃黏膜。其他三项都是刺激因素。

问答题
阅读理解

阅读理解。

     When I was six, Dad brought home a dog one day, who was called "Brownie". My brothers and I all loved

Brownie and did different things with her. One of us would walk her, another would feed her, then there were

baths, playing catch and many other games. Brownie, in return loved each and every one of us. One thing that

most touched my heart was that she would go to whoever was sick and just be with them we always felt better

when she was around.

     One day, as I was getting her food, she chewed up (咬破) one of Dad's shoes, which had to be thrown

away in the end. I knew Dad would be mad and I had to let her know what she did was wrong. When I looked

at her and said, "Bad girl," she looked down at the ground and then went and hid. I saw a tear in her eyes.

     Brownie turned out to be more than just our family pet, she went everywhere with us. People would stop

and ask if they could pet her. Of course she'd let anyone pet her. She was just the most lovable dog. There were

many times when we'd be out walking and a small child would come over and pull pm her hair. she never barked

(吠) or tried to get away. Funny thing is she would smile. This frightened people because they thought she was

showing her teeth. Far from the truth, she lovely everyone.

     Now many years have passed since Brownie died of old age. I still miss days when she was with us.

1. What would Brownie do when someone was ill in the family?

A. Look at them sadly.

B. Keep them company.

C. Play games with them.

D. Touch them gently.

2. We can infer from Paragraph 2 that Brownie _____.

A. world eat anything when hungry

B. felt sorry for her mistake

C. loved playing hide-and-seek

D. disliked the author's dad

3. Why does the author say that Brownie was more than just a family pet?

A. She was treated as a member of the family.

B. She played games with anyone she liked.

C. She was loved by everybody she met.

D. She went everywhere with the family.

4. Some people got frightened by Brownie when she _____.

A. smiled

B. barked

C. rushed to them

D. tried to be funny

5. Which of the following best describes Brownie?

A. Shy

B. Polite

C. Brave

D. Caring