题干

 健康人的体液必须维持在一定的酸碱度范围内,以下体液一定呈碱性的是(  )


A

B

C

D

体液

血浆

唾液

胃液

尿液

pH

7.35~7.45

6.6~7.1

0.9~1.5

4.7~8.4

A:A

B:B

C:C

D:D

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答案(点此获取答案解析)

A

同类题3

阅读下面短文, 从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

    I always wondered how people would react if I tried to approach a total stranger for help in a busy place like a street corner or a mall. I have always 1 a stranger who tried to catch my 2 in a busy place.

    Yesterday I was in a busy shopping mall buying a large piece of luggage because I just had the 3 to do it after many days of planning. After the 4, I picked up my phone from my pocket to call my driver waiting in the parking lot but my phone was 5.

    Then I requested the shop assistant who had 6 sold me the merchandise (which was not cheap), if she could ring my driver for me. She 7 that it was the shop policy that they cannot use 8 while working in the shop.

    After I got out of the shop onto the busy street, I 9 a young mother with her two kids to make the same 10. As soon as I said “Excuse me, madam!” she grabbed her kids and ran. I 11 a kidnapper(绑匪).

    I stood there wondering how many times I had 12 to strangers like the young 13. I stood there in the 14 street with people rushing by, looking at their faces to see if there was a sign of 15 on their face.

    I saw a man pretty shabbily dressed compared to me who 16 to notice me. I just stopped him and made my request. He 17 called my driver and waited till my car came to make sure I was picked up, turned around 18 I could thank him adequately and was gone.

    I was 19 by kindness and hope I will do20 to strangers who try to catch my attention from now on.