下列表格中各项分类都正确的一组是（）类别选项纯净物混合物_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

下列表格中各项分类都正确的一组是（）

类别选项	纯净物	混合物	电解质	非电解质
A	苏打	纯净空气	CaCO₃	干冰
B	碘酒	漂白粉	NH₃·H₂0	Fe
C	明矾	铝合金	石墨	醋酸
D	盐酸	CuSO₄·5H₂O	Na₂SO₄	酒精

答案

答案：A

题目分析：B种碘酒是混合物，铁是单质，不是电解质，也不是非电解质，B不正确；C中石墨是单质，不是电解质，也不是非电解质，而醋酸是电解质。D中盐酸是混合物，胆矾是纯净物，所以正确的答案选A。

点评：该题是物质分类的考查，试题基础性强，侧重概念的理解和应用，有利于培养学生分析问题、解决问题的能力。该题的关键是明确纯净物、混合物以及电解质和非电解质的含义，然后灵活运用即可。

完形填空

It was my birthday last Thursday. I decided to 36 it by inviting a few friends out to supper. I chose a restaurant in a _37_ part of town. It is one of my favorite restaurants because the food is good and the waiters are friendly. It is _38_ ever crowded, because not many people know about it, so it is not usually _39_ to book a table. In _40_ case, Thursday is not a busy evening.
When we entered the restaurant, we were surprised to find it completely __41_ . I___42__but not a singletable was free. One of the waiters recognized me. He came across and explained the situation. "A party of tourists came in about half an hour ago.” he said. "It was like an invasion (侵略). Suddenly the place was full! We can hardly_ 43_ ."
The waiter then pointed to a table in the corner. "The people there are about to _44_ ." he said, "Just hold on and you'll _45 _a place there." He was right. Fifteen minutes later, the people_46 the corner table paid their _47_ , got up and left. I led my friends across and we all sat down.
__48__ our table was almost out of sight. We tried to draw the attention of the waiter _49_ sent us there, but he, like all the other waiters, was busy 50_ the party of tourists. They ordered lots of food. At last, an hour later, the tourists were finishing their meal and looking very _51_ with life. The waiter now very tired, appeared at our table. I advised my friends about the best dishes and finally the waiter went off with our _52_ .
A few moments later he returned to our table. We could tell from his face that he had _53_ for us. 54_ a little sorry he told us that there was _55_ left. "All we can offer you" he said, "is an omelet (煎蛋卷) !"

D．congratulate

B．looked down

C．looked around

B．Fortunately

D．disappointed

A．good presents

D．bad presents

A．no meat or fish	B．no meat and fish
C．meat and fish	D．not meat or fish

单项选择题

1963年，（）将中共有关和平解决台湾问题的思想概括为“一纲四目”

A.毛 * *

B.刘 * *

C.朱德

D.周恩来