单选题 Questions 28 and 29 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now, listen to the news.

单选题 According to Senator Smith, how will the trade restrictions against Vietnam end?

A、 Vietnam withdraws its forces from Cambodia.
B、 Vietnam takes part in some peace-keeping programs.
C、 Vietnam offers more information about American soldiers missing in Vietnam.
D、 Vietnam permits American companies to invest in Vietnam.

【正确答案】 C

【答案解析】[听力原文]28-29
A senator is urging President Clinton not to end the trade restriction against Vietnam. Republican Senator Bob Smith says the restrictions should continue until Vietnam provides more information about Americans missing from the Vietnam War. President Clinton must decide by next week if he will order the restrictions continued for another year. On Tuesday, the Defense Department released some documents from the former Soviet Union that appeared to show that North Vietnam held hundreds more of American war prisoners than it had admitted. Defense officials say the documents must be examined closely.

[解析] 本题所有选项的主语都是Vietnam，[C]、[D]两次提到American，由此可推测这篇新闻是有关Vietnam和America两国之间的事。由新闻中的...until Vietnam provides more information about Americans missing from the Vietnam War可知答案为[C]。

单选题 Why were the documents released?

A、 To improve the relationship with Russia.
B、 To urge Clinton not to end the trade restriction.
C、 To prove that many soldiers are still missing.
D、 To provide more information about North Vietnam.

【正确答案】 B

【答案解析】[解析] 根据第28题的题解，可知[A]很可能不是答案。再由新闻中的...to show that North Vietnam held hundreds more of American war prisoners than it had admitted可知答案为[B]。