三硅酸镁被用来治疗胃酸过多的胃溃疡，是因为该物质不溶于水，服用后能中和胃酸，作用

发布时间：2017-06-27 22:33 │ 来源：www.tikuol.com

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问题：

三硅酸镁被用来治疗胃酸过多的胃溃疡，是因为该物质不溶于水，服用后能中和胃酸，作用持久。把三硅酸镁Mg₂Si₃O₈·nH₂O改写成氧化物的形式为____，它中和胃酸( HCl)的化学方程式是____。

考点：硅酸盐

题型：填空题

There _____________ a library in our school. [ ]

A. is

B. are

C. be

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阅读理解。

      Mother's Day is a holiday for mothers. It is celebrated (庆祝) in the United States, India and other
countries. In a short time, it becomes widely celebrated. Mother's Day is on the second Sunday in May.
On that day, many people send gifts of love to their mothers. Those whose mothers are still living often
wear a pink or red rose of carnation (康乃馨), while those whose mothers are dead wear a white one.
     The idea of a day for mothers was first given by Miss Anna Jarvis of Philadelphia. As a result of her
hard work, the celebration of the first American Mother's Day was held in Philadelphia on May 10, 1908.
Soon the holiday became popular all over the country and around the world.
     In China, people do the same on the same day for mothers. And in some cities, people sometimes ask
a song to be broadcast (广播) for his or her mother only. This might cost a little money for some of them,
but, as it says, "Love is invaluable."
     On May 8, 1999, just the day before the Mother's Day that year, a Chinese mother was killed in a
criminal bombing (罪恶暴行). Her name is Shao Yunhuan, a heroic mother. All the Chinese will remember
her for ever.

1. Mother's Day _____.

A: is a holiday for mothers.
B: is celebrated in the United States only.
C: is on May 10 every year.
D: was given by Miss Anna Jarvis.

2. What was the date of the Mother's Day in 1999?

A: May 7, 1999
B: May 8, 1999
C: May 9, 1999
D: May 10, 1999

3. On Mother's Day, people _____.

A: send some flowers to their mothers.
B: wear a pink or red rose or carnation.
C: wear a white flower.
D: send gifts of love to their mothers.

4. "Love is invaluable." Here "invaluable" means ______.

A: 美好的
B: 无价的
C: 永恒的
D: 无私的

5. Which of the following ideas do you agree to?

A: Shao Yunhuan is a heroic mother.
B: A Chinese mother is the same as an American mother.
C: The bombing can get away with the crime (逃过罪责).
D: All of the above

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△ABC中，D为AB上一点，E为AC上一点，添加一个条件______（只能填一个）可以使得△ABC与△ADE相似．

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通常用普鲁卡因作为局部浸润麻醉是因其()

A．毒性小，作用时间长

B．毒性小，作用起效快

C．毒性小，麻醉效果强

D．穿透力强

E．以上都不对

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肺炎链球菌肺炎治疗的首选抗生素是（）。

A．红霉素

B．庆大霉素

C．氧氟沙星

D．苄星青霉素

E．林可霉素

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