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Now listen to the following recording and answer questions 20 to 22.

A. Protecting people from alcohol abuse.
B. Increasing tax on alcohol production.
C. Raising the legal age for drinking.
D. Forbidding alcoholic drinks marketing.

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Now listen to the following recording and answer questions 16 to 19.

A. They are always alone by themselves.
B. They are tired of charging their batteries.
C. They do not like socializing with people.
D. They need time to prepare for social activities.

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设f（x），g（x）在[a，b]上连续，且满足∫axf（t）dt≥∫axg（t）dt，x∈[a，b），f（t）dt=∫abg（t）dt。证明∫abxf（x）dx≤∫axxg（x）dx。

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Now listen to the following recording and answer questions 16 to 19.

A. Quiet and confident.
Bold and loud.
C. Shy and energetic.
D. Tricky and timid.

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微分方程y"+y=e—xcosx满足条件y（0）=0的特解为________。

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Now listen to the following recording and answer questions 20 to 22.

A. Protecting people from alcohol abuse. B. Increasing tax on alcohol production. C. Raising the legal age for drinking. D. Forbidding alcoholic drinks marketing.

Now listen to the following recording and answer questions 16 to 19.

设f（x），g（x）在[a，b]上连续，且满足∫axf（t）dt≥∫axg（t）dt，x∈[a，b），f（t）dt=∫abg（t）dt。证明∫abxf（x）dx≤∫axxg（x）dx。

Now listen to the following recording and answer questions 16 to 19.

微分方程y"+y=e—xcosx满足条件y（0）=0的特解为________。

A. Protecting people from alcohol abuse.
B. Increasing tax on alcohol production.
C. Raising the legal age for drinking.
D. Forbidding alcoholic drinks marketing.