完形填空。 Yesterday when my son and I were e_爱下问搜题

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问题完形填空

完形填空。

     Yesterday when my son and I were eating dinner, I saw a policewoman walking past our house. A woman
with a   1   look was following her.
    I opened the   2 , went out and asked if everything was OK. The policewoman said that the woman's   3
had gone missing (失踪) an hour earlier. I said that we hadn't seen the girl, but we could   4 . I explained to
my son that we couldn't finish our   5   right then. He said, "Be a kind person, Dad." We got in our car and   6
the girl all over the town. Along the way, a group of children were playing.   7   they heard what had happened,
they said they would help   8 . They rode their bikes and joined us.
       9   the little girl was found safe a few miles away. I was so  10  to see many people help a stranger. It is
a nice world.

( )1. A. worried
( )2. A. mouth
( )3. A. son
( )4. A. succeed
( )5. A. housework
( )6. A. looked for
( )7. A. Before
( )8. A. them
( )9. A. Luckily
( )10. A. proud

B. laughing
B. car
B. daughter
B. eat
B. dinner
B. looked at
B. After
B. you
B. Possibly
B. strange

C. surprised
C. door
C. mother
C. help
C. games
C. looked after
C. Although
C. us
C. Sadly
C. happy

答案

1-5 ACBCB 6-10 ABCAC

填空题

运用相关原理，回答下列各小题：

Ⅰ．已知NaHSO₄在水中的电离方程式为NaHSO₄＝Na⁺+ H⁺+ SO₄^2- 。

（1）在NaHSO₄溶液中c（H⁺）_________c（OH^-）+ c（SO₄^2-）（填“＞”、“＝”或“＜”下同）；用硫酸氢钠与氢氧化钡溶液制取硫酸钡，若溶液中SO₄^2-完全沉淀，则反应后溶液的pH___________7（2）将20mLpH=2的NaHSO₄溶液逐滴加入到20mL 0.1 mol·L^-1Na₂CO₃溶液中，溶液中发生反应的离子方程式为：_________________；向此反应后的溶液中滴加 0.001 mol·L^-1BaCl₂溶液，首先析出的沉淀是_____________。[KSP（BaSO₄）=1.1×10^-10mol²·L^-2 ；KSP（BaCO₃）=5.1×10^-9mol²·L^-2]

Ⅱ．已知：在25时 H₂OH⁺+OH^-KW=10^-14CH3COOHH⁺+CH₃COO^- Ka=1.8×10^-5

（3）醋酸钠水解的平衡常数Kh的表达式为___________ 。当升高温度时，Kh将___________（填“增大”“减小”“不变”）；

（4）0．5mol·L^-1醋酸钠溶液pH为m，其水解的程度（已水解的醋酸钠与原有醋酸钠的比值）为a；1mol·L^-1醋酸钠溶液pH为n，水解的程度为b，则m与n的关系为__________，a与b的关系为________（填“大于”“小于”“等于”）；

（5）0．9mol·L^-1醋酸钠溶液中［OH^-］= mol·L^-1 在某溶液中含Mg²⁺、Cd²⁺、Zn²⁺三种离子的浓度均为0.01mol·L^-1。向其中加入固体醋酸钠，使其浓度为0.9mol·L^-1，以上三种金属离子中___________能生成沉淀，原因是______________。（KSP［Mg（OH）₂］=1.8×10^-11、KSP［Zn（OH）₂］=1.2×10^-17、 KSP［Cd（OH）₂］=2.5×10^-14、=2.2）

单项选择题

女性，43岁，因上腹疼痛，恶心、呕吐一天半就诊，诊断为急性坏死性胰腺炎，急诊手术后出现进行性呼吸困难和顽固的低氧血症，采用面罩吸氧，氧流量为8L／min，PaO48mmHg，其抢救应首先采用（）

A.人工膜肺

B.高压氧舱

C.高频通气

D.机械通气，应用PEEP

E.机械通气，应用反比呼吸