已知某土饱和密度为2.38g/cm3，水密度为1g/cm3，则该土浮密度为______。
A. 2.38g/cm3
B. 3.38g/cm3
C. 1.38g/cm3
D. 2.06g/cm3
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Now listen to the following recording and answer questions 20 to 22.
Alcohol use will cause diseases.
B. Women chink more than men.
C. Europe has the highest alcohol use.
D. Alcohol is addictive to everyone.
在西方，把课程用于教育科学的专门术语，始于教育家（ ）
A. 斯宾塞
B. 泰勒
C. 康德
D. 布鲁纳
Now listen to the following recording and answer questions 16 to 19.
A. Making small talks with many people.
B. Staying till very late in a large party.
C. Talking to only a small group of people.
D. Having conversations on different topics.
Now listen to the following recording and answer questions 20 to 22.
A. Drinking during dinner time.
B. Drinking to celebrate weddings.
C. Drinking at someone"s birthday.
Drinking with friends after work.
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