But to mark the tests, they have to use an answer key sent down from the States.

不过为了给测试判分，他们使用的是从美国发来的答案。

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It takes a lot of time to prepare, administer and mark the tests.

出题，监考和阅卷要花很多时间。

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Earlier, BBC Northern Ireland's political editor Mark Devenport said tests were being carried out on the MP.

BBC: DUP MP Nigel Dodds in hospital after taking ill

It compared scores of 13-year-olds in maths and science tests, calibrating the scores so that a mark of 500 was equal to the international average.

ECONOMIST: Education and the wealth of nations | The

"We are probably overtreating a lot of patients, " says Harvard Medical School pathologist Mark Rubin, who is working on DNA tests to predict the future aggressiveness of a tumor.

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