单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．A more economical diesel fuel.
B．Characteristics of a new type of fuel.
C．Where a new energy source is located.
D．How to develop alternative energy sources.

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单项选择题

A．In the side street.B．At the crossroads.C．On the main road.D．On the motorway.

A．In the side street.
B．At the crossroads.
C．On the main road.
D．On the motorway.

问答题

“空巢老人”指那些到了退休年龄，身边却无子女与之共同生活的老人。1．如今的空巢老人逐渐增多2．这种现象出现的原因3．如何解决由此带来的问题The Phenomenon of Empty Nest

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

Questions 19 to 21 are based on the conversation you have just heard.