职称英语在线答题

每日一练：职称英语考试卫生类每日一练(2015-10-24)
【单选题】

Using HIV Virus to Cure Cancer

Scientists are planning to use humanimmunodeficiency(免疫缺陷)virus(HIV)，one of mankind's most feared viruses，as acarrier of genes which can fight cancer and a range of diseases that cannot becured.The expels say HIV has an almost perfect ability to avoid the body'simmune(免疫的)defenses，making itideal for carrying replacement genes into patients'bodies，according to the Observef

A team at the California-based Salk Institute，one of the world's leading research centers on biological sciences，has created a special new breed of HIV and has started negotiationswith the U.S.Food and Drug Administration(FDA)to begin clinical gene therapy(治疗)trials this year.The first trials are expected to involve patientssuffering from cancers that cannot be cured by surgery although project leaderProfessor Inder Verma said the HIV technique would have"far widerapplications".

The plan remains very likely to causecontroversy since it involves making use of a virus which has caused more than22 million deaths around the world in the past two decades.Verma said that theidea of using HIV for a beneficial purpose was"shocking'' but the fiercenature of HIV had disappeared by having all six of the potentially deadly genesremoved.

Illnesses such as various cancers are causedwhen a gene in a patient's body fails to work properly.In the past two years，breakthroughs in genetics(遗传学)have led genetherapy scientists to try and replace the genes that do not function normally.

Unfortunately.the body's immune defenses havebeen known to attack the modified genes and make them lose their effects beforethey can start their task and progress in the field has been held up by thelack 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 thismakes it attractive to scientists as a way of

secretly conveying replacement genes intopatients'bodies.

1.FDA has approved the plan of using HIV tocure cancer in humans

A.Right

B.Wrong

C.Not mentioned

2.The idea of using HIV for a beneficialpurpose has been widely accepted

A.Right

B.Wrong

C.Not mentioned

3.HIV can be safely used to cure cancer only ifthe deadly genes have been removed

A.Right

B.Wrong

C.Not mentioned

4.The HIV virus is an excellent warrior tofight the body's immune cells

A.Right

B.Wrong

C.Not mentioned

5.Other countries are also expected to beginclinical gene therapy trials soon

A.Right

B.Wrong

C.Not mentioned

6.It is the lack of money that has held uD theprogress in using replacement genes to cure cancen

A.Right

B.Wrong

C.Not mentioned

7.The HIV virus has caused more deaths indeveloped countries

A.Right

B.Wrong

C.Not mentioned