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.
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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.
设f（x，y，z）=ex+y2z，其中z=z（x，y）是由方程x+y+z+xyz=0所确定的隐函数，则fz"（0，1，—1）=________。
函数y=ln（1—2x）在x=0处的n阶导数y（n）（0）=________。
已知，y1=x，y2=x2，y3=ex为方程y"+p（x）y"+q（x）y=f（x）的三个特解，则该方程的通解为（ ）
A. y=C1x+C2x2+ex
B. y=C1x2+C2ex+x
C. y=C1（x—x2）+C2（x—ex）+x
D. y=C1（x—x2）+C2（x2—ex）
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