Question

The choices people make can cause cancer. Not everyone who 1. (use) tobacco products will get cancer, but the chance of getting certain 2. (type) of cancer increases with tobacco use. The recent research 3. (show) us that the constant misuse or overuse of alcohol may cause cancer of the mouth and throat as well recently.

Sometimes cancer can be caused by radiation 4. (find) in sunlight and X-rays, in addition 5. other places. This doesn't mean you should stop getting X-rays or stay indoors, but limiting your 6. (expose) to radiation can reduce the chances of developing cancer. The X-rays you get at 7. doctor's or dentist's office are not 8. (typical) enough to cause cancer.

And sometimes, the reason 9. someone gets cancer is simply an unfortunate mystery. Some cells in the body may start to increase and change. Doctors and researchers can see it happening, 10. they cannot provide a description of why it started.

Answer

1.uses

2.types

3.has shown

4.found

5.to

6.exposure

7.the

8.typically

9.why

10.but

【解析】本文是一篇说明文。文章主要介绍了癌症的成因。

1.考查了主谓一致。本处who指代先行词everyone，从句的谓语动词应用单数形式；叙述一般的情况应用一般现在时，故本处用uses。句意：不是每个使用烟草产品的人都得癌症。故用uses。

2.考查名词。certain前没有冠词，且type为可数名词，certain types of cancer意为“某些种类的癌症”。句意：但是吸烟会使某些癌症的发病率增加。故填types

3.考查时态。主语research与show之间是主谓关系，又由时间状语“recently”可知应用现在完成时，主语为单数。句意：最近的研究表明。故用has shown。

4.考查非谓语动词。本处find与被修饰的名词之间为动宾关系，故用过去分词形式。句意：有时癌症是由日光、X光以及别的地方发现的辐射引起的。故用found。

5.考查短语固定搭配。in addition to“此外”。句意：除了其他地方。故填to。

6.考查名词。本处物主代词your后加名词形式。句意：限制你对辐射的接触(exposure)能够降低患癌症的可能性。故填exposure。

7.考查冠词。the doctor's指“诊所”，因此此处用定冠词the。句意：在医生或牙医的办公室。故填the。

8.考查副词。因为enough为形容词，故前面用副词修饰。句意：通常不足以引起癌症。故填typically。

9.考查定语从句关系词。本处先行词为the reason，定语从句中缺原因状语，故用关系副词。句意：有时，某人得癌症的原因确实是一个不幸的谜。故填why。

10.考查连词。上下句之间可知为转折关系。句意：医生和研究人员能够看到细胞的扩散和变化，但是不能描述这为什么发生。故用but。