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have led gene therapy scientists to try and replace the genes that do not function normally.
Unfortunately, the body’s immune defenses have been known to attack the modified genes and make them lose their effects before they can start their task and progress in the field has been held up by the lack of a suitable carrier.           
The HIV virus has the ability to escape from, and then destroy, the immune defense cells designed to protect our bodies and this makes it attractive to scientists as a way of secretly conveying replacement genes into patients’ bodies.
1 FDA has approved the plan of using HIV to cure cancer in humans.
     A  Right             B  Wrong             C  Not mentioned   
2 The idea of using HIV for a beneficial purpose has been widely accepted.
     A  Right             B  Wrong             C  Not mentioned   
3 HIV can be safely used to cure cancer only if the deadly genes have been removed.
     A  Right             B  Wrong             C  Not mentioned   
4 The HIV virus is an excellent warrior to fight the body’s immune cells.
     A  Right             B  Wrong             C  Not mentioned   
5 Other countries are also expected to begin clinical gene therapy trials soon.
     A  Right             B  Wrong             C  Not mentioned   
6 It is the lack of money that has held up the progress in using replacement genes to cure cancer.
     A  Right             B  Wrong             C  Not mentioned   
7 The HIV virus has caused more deaths in developed countries.
A  Right              B  Wrong             C  Not mentioned 
第3部分：概括大意与完成句子
Exercising Your Memory
1   Aging does not mean a dramatic decline in memory power, unless you help it help by letting your mind go.
2   That's not to say that memory doesn't change throughout life. Researchers divide memory into categories based on the length of time when memories are stored. One system divides it up as short-term (less than one minute; remembering a telephone number while you dial, for instance), long-term (over a period of years) and very long-term memory (over a lifetime).
3   Short-term memory isn't mastered until about age 7, but after that you never lose it. 本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。