development.Cancers discovered early usually can be treated successfully.

　　The test examines very small bits of fat in the blood called lipids (脂质)．Cancers seem to change lipids although doctors do not know why.The test showed differences between the lipids of the persons with cancer and the lipids of those without cancer.

　　The researchers say the new test could be a step to develop a simple way to check patients for cancer before the disease shows on an X­ray.

　　【语篇解读】　本文为说明文，主要介绍了科学家在破解癌症问题方面所取得的一些研究成果。

　　1．Who will have cancer from the study of the researchers?

　　A．The young.

　　B．The middle aged and the older.

　　C．The man.

　　D．The woman.

　　B　[细节理解题。从第一段中的"cancers are particularly likely to attack persons in their middle and advanced years"可知，癌症特别容易在中老年人的身上发生。]

　　2．The underlined words "such a test" refer to ．

　　A．the test that shows which persons have cancer and which don't

　　B．the test that may be able to show cancer very early in its development

　　C．a simple medical test that cannot find cancer when it is small

　　D．a new test that could be a step to develop a difficult way

　　B　[词义猜测题。分析上下文可知，such a test与"a simple medical test can find cancer when it is still small"中的test指的是同一种方法，即"一种简单的能诊断早期癌症的方法"。]

　　3．Which of the following statements is TRUE according to the passage?

　　A．Cancers have much to do with something in patients' blood.

　　B．People living in better conditions are most likely to be attacked by cancer.

　　C．X­raying is the best way to determine whether a person has cancer or not.

　　D．Cancers have nothing to do with a person's habits and living conditions.

A　[事实判断题。第三段中提到了癌症病人血液中有的东西健康人的血液