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【简答题】
请用化学知识回答： （1）化石燃料通常是指煤、______、天然气；用石灰浆粉刷墙壁后的室内放置一燃烧的煤炉，可使墙壁迅速硬化，同时墙壁上会出现一些水珠，其原因是（用化学方程式表示）______． （2）如果煤炭长期密实地堆积，可能会因______导致温度升高而自燃；当大量堆积的煤发生燃烧时，灭火的最好方法是______（写一种）． （3）汽车的尾气管中装有、钯的合金网，目的是将汽油燃烧时产生的有害气体CO、NO转变为CO 2 和N 2 ，那么这些金属在反应中起的作用是______．
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【简答题】Both of the boys are good at singing.(翻译)
【单选题】Unfortunately, when I dropped in, Doctor Wang_____for Chengdu to join in the fight again bird flu, so we only had time for a few words.
A.
just left.
B.
has just left.
C.
is just leaving.
D.
was just leaving.
【单选题】—What about the student in your class, Mr. Wang? —The doctor said that ________ sleep caused him poor memory and poor concentration.
A.
lacking of
B.
lacked in
C.
lacking
D.
lack for
【简答题】____________(夫人)Wang is a doctor.
【单选题】Can I make an _________ with Doctor Wang?
A.
appointment
B.
appoint
C.
disappoint
D.
disappointing
【单选题】. Doctor Wang _____ at seven o’clock for the conference, but she didn’t turn up.
A.
should have arrived
B.
should arrive
C.
should be arrived
D.
should be arriving
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