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【单选题】
In order to ______ the improved features of the new model dishwasher, the salesman encouraged the customer to operate it by himself.
A.
demonstrate
B.
exhibit
C.
reveal
D.
uncover
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【简答题】(本小题满分16分) Ⅰ.汽车尾气(含有烃类、CO、SO 2 与NO等物质)是城市空气的污染源。治理的方法之一是在汽车的排气管上装一个“催化转换器”(用铂、钯合金作催化剂)。它的特点是使CO与NO反应,生成可参与大气生态环境循环的无毒气体,并促使烃类充分燃烧及SO 2 的转化。 (1)写出一氧化碳与一氧化氮反应的化学方程式 (2)“催化转换器”的缺点是在一定程度上提高空气的酸度,其原因是 (3)控...
【简答题】气态污染物可以分为五大类:含( )化合物,含( )化合物,( )的氧化物,( )化合物以及( )化合物等。
【简答题】Choose the correct meaning of the words and phrases.
【多选题】choose the phrases in which “ to be thrown into”is used properly
A.
to be thrown into happiness
B.
to be thrown into confusion
C.
to be thrown into excitement
D.
to be thrown into prison
【多选题】choose the words and phrases to express“相似”
A.
have  in  common with
B.
have noting to do with
C.
bear comparison with
D.
similarly
【简答题】洞庭碧螺春产于岳阳洞庭湖。()
【简答题】Choose the suitable phrases to match:
【多选题】Listen and choose the words and phrases you hear.
A.
play the violin
B.
sing
C.
play the guitar
D.
dance
E.
play the drums
F.
draw; tell stories
G.
play the piano
【简答题】Choose the right words or phrases.
【简答题】Choose the correct words or phrases to complete the sentences.A. The new credit cards will be of great ____________ to our customers.B. Do you have to ____________ tickets in advance?C. The __________...
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