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请根据下列实验回答问题： （1）A中为了防止生成物扩散到空气中污染空气，集气瓶中最好放入 溶液； （2）B试验通过量筒中 变化测出氧气的体积； （3）写出C实验发生反应的方程式 ； （4）D实验烧杯中水的作用是 、 ．
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【简答题】As the economy develops, the number of cars grows rapidly. It brings us with great con-venience as well as troubles. Look at the picture and write an essay of about 120 words ref-erence to the ...
【简答题】Shyness is the cause of much unhappiness for a great many people．Shy people are anxious and self-conscious; that is, they are concerned with their own appearance and actions too much．Negative thoughts...
【单选题】Everyone is encouraged to _____ something to those who suffered a great deal in the earthquake.
A.
construct
B.
connect
C.
contribute
D.
collect
【单选题】To our great surprise, the painting _______ should have won the prize.
A.
considered being copied
B.
considering to be copied
C.
considering having been copied
D.
considered to have been copied
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