短波

请阅读短文，并完成后面的选择题。

      Hello, friends! My name is Zoom. Today is Sunday. My father, my mother, my sister and I are at home.

We are busy now. Look, my father is writing an e-mail to my grandpa. My mother is cooking dinner. My sister

is listening to music. I am watching TV. Oh, my little kitty is eating fish. What a busy Sunday! Do you often

have a busy Sunday?

1. What day is it today?  ___________

A. It's Sunday.

B. It's Monday.

2. Zoom's father is ___________.

A. writing an e-mail

B. reading a newspaper

3. Zoom's mother is ___________.

A. cleaning the room

B. cooking dinner

4. Zoom's ___________.

A. doing his homework

B. watching TV

5. Who is eating fish?  It's ___________.

A. Zoom's sister

B. Zoom's cat

钡盐行业生产中排出大量的钡泥[主要含有BaCO₃、BaSiO₃、BaSO₃、Ba(FeO₂)₂等]．某主要生产BaCl₂、BaCO₃、BaSO₄的化工厂利用钡泥制取Ba(NO₃)₂，其部分工艺流程如下

(1)酸溶后溶液的pH＝1，Ba(FeO₂)₂与HNO₃反应的化学方程式为____________________________________________________________．

(2)酸溶时通常控制反应温度不超过70℃，且不使用浓硝酸，原因是________________、____________________________.

(3)该厂结合本厂实际，选用的X为________(填化学式)；中和Ⅰ使溶液中________(填离子符号)的浓度减小(中和Ⅰ引起的溶液体积变化可忽略)．

(4)上述流程中洗涤的目的是________________________________．

列有关胆酸的论述，错误的是（）

A.易溶于水

B.可溶于乙酸

C.易溶于碱水

D.溶于浓硫酸成黄色溶液

E.可用稀乙酸重结晶

下列现象中，不属于利用大气压强的是（　　）

A．钢笔吸墨水

B．茶壶盖上要开一个小孔

C．用吸盘挂钩挂物品

D．用高压锅煮食物

眼的屈光，从远视眼视网膜反射出来的光线是（）。

A.平行光线

B.发散光线

C.集合光线

D.虚光线