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  3. Promising Results from Cancer Study A new experimental vaccine(疫苗)has shown promising results in the fight against lung canc

Promising Results from Cancer Study A new experimental vaccine(疫苗)has shown promising results in the fight against lung canc

admin2013-07-25  65
问题                     Promising Results from Cancer Study
    A new experimental vaccine(疫苗)has shown promising results in the fight against lung cancer. In a small Texas-based study, a vaccine developed by scientists at Baylor University Medical Centre in Dallas, USA, cured lung cancer in some patients and slowed the progress of the disease in others.
    Researchers have reported encouraging findings from this small study. Forty-three patients suffering from lung cancer were involved in these trials. Ten of these patients were in the early stages and thirty-three in the advanced stages of the disease. They were injected with the vaccine every two weeks for three months, and were carefully monitored for three years. In three of the patients in the advanced stages of cancer, the disease disappeared and in the others, it did not spread for five to twenty-four months. However, no great difference was seen in the patients in the early stages of the illness.
    This new vaccine uses the patient’s own immune system. It is made specifically for each patient and is injected into the arm or leg. It stimulates(刺激)the body’s immune system, which then recognizes that the cancer cells are harmful, and attacks and destroys them.
    The vaccine could be effective against other forms of cancer. It offers great hope for the treatment of cancer in general, although further studies are needed before such treatment can be widely used.
The vaccine activates the immune system.
选项 A、Right
B、Wrong
C、Not mentioned
答案A
解析 题意：这种疫苗激活了免疫系统。关键词是activates。依据此关键词，可在文中第三段第三句找到相关叙述：“It stimulates the body’s immune system，which then recognizes that the cancer cells are harmful，and attacks and de—stroys them．”(疫苗能刺激人体免疫系统，使免疫系统意识到癌细胞是有害的，从而攻击和破坏它们。)由此可见这种疫苗是通过激活免疫系统发挥作用的，故此题说法为“正确”的。
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