After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

听到问题后，必须从A、B、C、D四个选项中选出最佳选项。

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For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre.

每题都有对应标记的A、B、C和D四个选项，请选择最佳选项并在答题卡2的相应字母中间划横线。

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In the A, B, C, D and F grading system, the first four letters are typically considered passing grades.

在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。

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The team examined results from a Norwegian study of nine hundred fifty-four people with C.O.P.D.

VOA: special.2009.06.03

In nineteen eighty-four, the John F.Kennedy Center for the Performing Arts in Washington,D.C.

VOA: special.2009.11.29

In fact, it was not until nineteen sixty-four that D.C.

VOA: special.2009.03.20

The four-engine C-17 jet can land on a runway only 3, 000 feet long and 90 feet wide, according to a document from the Department of Defense.

CNN: U.S. may sedate Afghan detainees during flights

And the modernisation plans comes as the UK is increasing its ability to deploy forces abroad, with six new roll-on, roll-off ferries, and the leasing of four giant C-17 cargo planes, leased from the Americans, which can carry Apache attack helicopters or Chinooks around the world.

BBC: NEWS | UK | The armed forces of the future

About one in four of the deliveries were C-section births and the remainder were vaginal deliveries.

BBC: C-section 'may double risk of childhood obesity'