5.

　　There are three main types of viurs that cause flu, which are called type A, B and C. Type A is the most powerful of the three, and undergoes minor changes in its genetic material every few years. The new form of the virus is called a strain. The new strain is not affected by the current vaccines. It is said to be “resistant” to them. So doctors must be continually producing new vaccines to combat the new strains of virus.

　　A. The effects of flu and its symptoms

　　B. Types of virus to cause flu

　　C. People’s attitudes toward flu

　　D. The cause of flu

　　E. The way that flu spreads

　　F. The methods to fight flu

　　参考答案

　　基础操练

　　Ⅰ. 1-5.ABCCB

　　Ⅱ. 1. causing

　　2. powerful

　　3. mind

　　4. related

　　5. offered

　　6. disagreed

　　7. recognized

　　8. forbid

　　9. likely

　　10. treatment

　　Ⅲ. A.1. pay for

　　2. paid off

　　3. get paid

　　4. paid

　　5. pay back

　　B. 1. broke into 2. broke out

　　3. broke up

　　4. break through

　　5. broke down

　　6. break away from

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