读短文，选择正确答案。

      My village is very beautiful. There are many mountains near my village. There is a forest in the mountains.

There are many big trees in the forest. Two bridges are over the river. The river is near my house. Look! There

are many ducks and boats on the river. There are many fish in the river. I love my village very much.

1. Where are the ducks?

A. They are on the grass.

B. They are on the river.

C. They are in the river.

2. Are there any mountains near my village?

A. Yes, there is.

B. Yes, there are.

C. No, there aren't.

3. Is there a river?

A. Yes, there are.

B. No, there isn't.

C. Yes, there is.

4. Is it a beautiful village?

A. Yes, this is.

B. Yes, there is.

C. Yes, it is.

5. Do you like the village?

A. Yes, I can.

B. Yes, I am.

C. Yes, I do.

某实验小组想验证Mg粉和CO₂的反应，请从下图中选用所需的仪器（可重复选用）组成一套进行该实验的装置。现提供浓H₂SO₄、稀盐酸、镁粉、大理石、澄清石灰水、饱和NaHCO₃溶液、饱和Na₂CO₃溶液。（连接和固定仪器用的玻璃管、胶管、铁夹、铁架台及加热装置等均已略去）

(1)将所选仪器按连接顺序由上至下依次填入下表，并写出该仪器中应加的试剂（可不填满）。

(2)A中发生反应的离子方程式为____________________。

(3)组装好仪器，检查气密性良好后，加入药品。在加热反应管C之前应进行的操作和目的是________________________。

(4)反应中C装置的主要现象是______________________。