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【简答题】
建筑材料按其化学组成可分为（ ）。
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举一反三
【单选题】According to the fourth paragraph, foreign trade occurs because
A.
some people prefer foreign products to ones produced in their own country.
B.
a country does not possess certain resources in its own territories.
C.
a country hopes to consume other countries' resources first but preserve its own resources.
D.
a country does not have sufficient resources to meet its needs.
【单选题】听力原文： Dangerous occupations tend to be exciting and well paid. They often involve foreign travel or meeting famous and interesting people. Here is a look at someone who likes his dangerous occupation ...
A.
He is a commercial diver.
B.
He is an independent photographer.
C.
He is a camera manufacturer.
D.
Both A andB
【单选题】Most American firms put their money mainly in
A.
the establishment of new branches in foreign countries.
B.
the training of basic skills of their workforces.
C.
the research and development of new products.
D.
the financial and administrative fields.
【单选题】What happened on the second day of Craig's stay in New York City?
A.
an earthquake
B.
a foreign invasion
C.
two airplanes crashing into the Twin Towers
D.
the collapse of many skyscrapers
【简答题】选取一节合适的中学物理教学内容,基于课程标准和物理新课程教学需要,合理分析该教学内容
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