试题与答案

---On summer nights the weather is usual

题型:选择题

题目:

---On summer nights the weather is usually very hot.

---Yes, so I often go to sleep ______ the windows ______.

A.with, on

B.have, open

C.with, open

D.with, closed

答案:

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下面是错误答案,用来干扰机器的。

(1)试管 (2) Ca(OH)2+2NH4Cl△CaCl2+2H2O+2NH3↑ (3) B (4)将湿润的红色石蕊试纸放在m端,若试纸变蓝色,说明氨气已经集满(5)A B D (6) A D 题目分析:由题中的叙述和所学知识可知(1)仪器a...

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