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粮店售米用的长方体木箱所有棱长的和是10.4米，木箱的长是1.2米，宽是0.6米，这个木箱的高是多少米？

答案

10.4÷4-（1.2+0.6）

=2.6-1.8

=0.8（米）；

答：这个木箱的高是0.8米．

实验题

有下列装置，其中A是气体发生装置，B、C、D、E是气体收集装置，E还可作气体的净化装置（E装置有多个备用）

（1）当用大理石和盐酸制取CO2时，选取的收集装置是     （填“B”或“C”或“D”）为了得到纯净、干燥的CO2，首先在E装置中注入足量的NaOH溶液来除去HCl，你认为该方法是否恰当并说明理由          ，然后在另一个E装置中注入浓硫酸，其作用是              。

（2）当用过氧化氢溶液和二氧化锰来制取氧气时，A中发生反应的化学方程式为          ，若a与c相连来收集氧气，还需将装置E        。
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单词拼写
根据下列各句句意和空白之后的汉语提示词，在指定区域的横线上写出对应单词的正确形式，每空只写一词。
1. Many college students think it ______ (值得) learning more  than one foreign
language.
2. Nowadays people use ______ (信封) less and less because they turn to other
forms of communication rather than write letters.
3. He risked his life to save the little girl who was ______ (挣扎) in the icy water.
4. He often ______ (后悔) wasting the precious time when he  should have studied
at school.
5. The athletes taking part in the Olympic Games are young and  ______ (身体) fit.
6. Alice was scolded by the teacher because she left without being ______ (允许).
7. We asked the stranger the question out of ______(好奇).
8. This design is ______(稍微) different from that one.
9. The Chinese diet is considered to be one of the ______(最健康) in the world.
10. The fire broke out in a big neighborhood, making over three  ______(百) people
homeless.		1.______
2 ______
3. ________
4. ________
5. ________
6. ________
7. ________
8. ________
9. ________
10. _______
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