4. There is evidence that smoking is responsible for breast cancer（乳癌）.
A. Right B.Wrong C. Not mentioned
分析：题干中涉及两层信息：evidence 和smoking is responsible for breast cancer。利用题干中的黑体词作为答案线索词，没有在文章中找到包含该答案线索词的句子所以判断问题句的说法为“没提到”。
6. Nicotine （尼古丁）is poisonous.
A. Right B.Wrong C. Not mentioned
分析：利用该句句意判断该句说法正确，这样答案可能是正确或没提到。题干中涉及1层信息。利用题干中的黑体词作为答案线索词，这样直接在文章中找到包含答案相关词的句子，确认答案。
Apart from statistics, it might be helpful to look at what tobacco does to the human body. Smoke is a mixture of gases, vaporized chemicals, minute particles of ash and other solids. There is also nicotine, which is powerful poison, and black tar（焦油）.
补充：
Apart from: prep. 远离, 除...之外
Minute: adj. 微小的, 详细的
Grammar:
What: 引导名词性从句时可翻译成：（所）…的
e.g. Everyone should do what he thinks right.每个人都应该做自己认为是正确的事。
e.g. I believed what she told me. 我相信她和我说的话。
Of: 由…制成的；由…组成的; 包含..；容纳..
e.g. a dress of cotton 棉布衣服
e.g. a bag of potatoes 一袋土豆
e.g. a kilo of butter 一公斤黄油
7. Filters and low tar tobacco make smoking safer.
A. Right B.Wrong C. Not mentioned
分析：题干中涉及到1层信息：Filters and low tar tobacco make smoking safer。利用题干中的黑体词作为答案线索词，这样在文章中找到直接答案相关句，确认答案。
As smoke is breathed in, all those components from deposits on the membranes of the lungs. One point of concentration is where the air tube and bronchus divides. Most lung cancer begins at this point.
Filters and low tar tobacco are claimed to make smoking to some extent safer, but they can only slightly reduce, not eliminate the hazards.
补充：
Deposit: n. 存款；储蓄; 定金；押金; vt. 放下；存放；储蓄
current deposit 活期存款
e.g. She deposited her money in the bank. 她把钱存在银行里。
Eliminate: vt.排除, 消除v.除去
Synonyms: dispose of, exclude, get rid of, reject, remove, throw out
Slightly: adv.稍微地
Concentrate: v. 集中（注意力、思想等）, 集中于某处；使集中于一点
e.g. A driver should concentrate on the road when driving.开车时驾驶员的注意力要集中在路上。
e.g. Industrial development is being concentrated in the west of the country.这个国家的西部正集中发展工业。
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