单项选择题

Accoring to the speaker, a sensible way to solve car pollution is that we should（）

A．focus on one method only.
B．explore some other alternatives.
C．improve one of the four methods.
D．integrate all of the four methods.

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4（）

单项选择题

According to the news, Vietnam may be willing to help America mainly because of（）

A．its changed policy towards America.
B．recent international pressure.
C．its desire to have the US trade embargo lifted.
D．the impending visit by a senior US military officer.

Accoring to the speaker, a sensible way to solve car pollution is that we should（） 您的浏览器不支持 audio 元素。

Accoring to the speaker, a sensible way to solve car pollution is that we should（）