问题
不定项选择题
向一定量的饱和氢氧化钠溶液中，加入少量的氧化钠（氧化钠与水反应生成氢氧化钠），恢复到原来的温度时，下列说法不正确的是 [ ]
A、溶液中Na+的总数不变
B、单位体积内的OH﹣数目不变
C、溶液溶质质量分数不变
D、溶液质量不变
答案
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向一定量的饱和氢氧化钠溶液中，加入少量的氧化钠（氧化钠与水反应生成氢氧化钠），恢复到原来的温度时，下列说法不正确的是 [ ]
A、溶液中Na+的总数不变
B、单位体积内的OH﹣数目不变
C、溶液溶质质量分数不变
D、溶液质量不变
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| 完形填空。 | |||
| Body language is used by people for sending messages to one another. It is very __1__ because it can help you make yourself easily understood when you are talking with others; you are not just using words, but also using expressions and __2__ . For example, waving one's hand is to say" Good-bye" . Shaking hands means welcome, and clapping hands __3__ congratulations. Nodding the head means agreement, but shaking the head means disagreement. The gestures are __4__ both by the Chinese and foreigners as having __5__ same meanings. Different countries have different body language. For example, when in Russia, France and Arab people kiss each other when they meet, but men in China or Australia shake hands __6__ kissing. People in Puerto Rico like touching each other, but people in Britain do not touch each other. People in Arab like standing __7__ one another when they are talking, __8__ English people must keep a distance __9__ when they are talking. When you use a foreign language it is very important to know the meanings of gestures and movements in the foreign country. __10__ the customs will help you communicate with people and make you stay there much more pleased and comfortable. | |||
| ( ) 1. A. helpful ( ) 2. A. words ( ) 3. A. to mean ( ) 4. A. received ( ) 5. A. a ( ) 6. A. instead of ( ) 7. A. nearly ( ) 8. A. and ( ) 9. A. from ( ) 10. A. Taking | B. difficult B. gestures B. mean B. accepted B. as B. stand for B. far away B. or B. of B. Refusing | C. easy C. handshake C. means C. receiving C. / C. such as C. close to C. but C. to C. Following | D. useless D. idioms D. meaning D. accepting D. the D. compared to D. side by side D. however D. away D. Saying |
