题干

下面的文字说明了利用“溶瘤病毒”消除肿瘤的过程,请概括这个过程的三个阶段。

    据有关专家介绍:如果将一种经过基因工程加工的“溶瘤病毒”注射人肿瘤部位,病毒就会成千上万地高速复制,最终撑破肿瘤细胞,肿瘤也就溶解了。但也因此使部分肿瘤细胞进人血液,随着循环系统进入其他部位,从而导致肿瘤的转移。此时,如果对病人肿瘤部位加热,人体会大量产生一种叫热休克蛋白的特殊物质。而热休克蛋白可以训练人体免疫系统识别肿瘤细胞,进而在全身“追杀”肿瘤的残部。经过这样一个过程,就能达到消除肿瘤的目的。

①第一阶段:____;(不超过15个字)

②第二阶段:____;(不超过15个字)

③第三阶段:____。(不超过20个字)

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\u6ce8\u5c04\u201c\u6eb6\u7624\u75c5\u6bd2\u201d\u4f7f\u80bf\u7624\u6eb6\u89e3,\u52a0\u70ed\u80bf\u7624\u90e8\u4f4d\u4ea7\u751f\u70ed\u4f11\u514b\u86cb\u767d,\u70ed\u4f11\u514b\u86cb\u767d\u8bad\u7ec3\u514d\u75ab\u7cfb\u7edf\u6d88\u9664\u80bf\u7624\

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    I was a shy girl. I didn't even like to answer the telephone for fear I'd have to talk to somebody I didn't know. I enjoyed the loneliness of exploring nature. However, at school I had to spend all day in the company of others. My escape was reading. I spent a lot of time studying and was rewarded with good grades. My only failure was Spanish—I'd get all. As on my written work and tests, but Ds and Fs on the spoken part.

    Eventually I went to college. During my third year of college, I had enough of being shy and determined to change my outlook and behavior. One day while at school, I noticed an advertisement for positions on the local classical music radio station. I had grown up listening to classical music, and I could easily pronounce names such as Tchaikovsky, Albinoni, and Chopin.

    I had absolutely no background in radio, and absolutely no hope of getting the job. The idea of talking to thousands of listeners in “radio land” terrified me. However, I luckily survived the interview. I was given brief descriptions of symphonies(交响乐)and a public service announcement to read, and a list of composers' names to pronounce. It wasn't hard for me. I left the recording session(录音时段)with a sense of relief and a sense of accomplishment. About two weeks later I actually landed the job. It was a challenging job, but I grew to enjoy it greatly. I began to feel comfortable talking to people.

    Although I now spend many hours each week talking with people, I'm still basically a quiet person. Perhaps it is my soft voice and my quiet nature that helps draw people out as they respond to my questions as I interview them. My former shyness is a fortune, as I can relate to people who feel discomfortable when they talk to newspaper reporters. I still enjoy moments of loneliness and the peace found in nature. But I'm also glad I decided to make a change in my life that has opened many doors and opportunities that I never knew existed.