题型:阅读理解 题类:常考题 难易度:普通
河南省豫东名校2018-2019学年高一上学期英语12月联考试卷
With their furry round heads and big black eyes, Zhongzhong and Huahua look just the same as any other monkey. But they happen to be the world's first cloned (克隆的) monkeys.
Years ago, scientists used cloning techniques to produce Dolly, the world's first cloned mammal (哺乳动物).They now used the same technique to produce the monkeys in China.
In animal cloning, animals are produced in a lab by using DNA that is taken from the cells (细胞) of a naturally-born animal. To clone Zhongzhong and Huahua, scientists from the Chinese Academy of Sciences (CAS.中国科学院) first removed the nucleus (细胞核) from a monkey's egg cell (卵细胞). They then put another nucleus taken from the monkey's body cells into the egg cell. The newly-formed egg was put into the womb (子宫) of a female monkey. Finally, Zhongzhong and Huahua were born.
The cloning process is hard, especially removing nucleus. It needs to be done in a fast and precise (精确的) way. The faster you do it, the less damage is done to the egg, according to CAS. Scientist Liu Zhen spent three years practicing removing the nucleus.
Unlike common monkeys, cloned monkeys have the same DNA as each other. When doing experiments on them, scientists can easily know that certain results are caused by different treatments, rather than different genes.
According to Sun Qiang from CAS, most drug trials (药物试验) are done on lab mice. However, drugs that work on mice might not work on humans. The two species are very different.
"Monkeys and humans are much closely related and testing on monkeys is supposed to be as effective (有效的) as testing on humans," Sun added.
People who are confident really seem to be naturally outstanding and just seem to do everything with more styles than others. {#blank#}1{#/blank#} It is a habit that everyone can develop in life. Try these simple tips to drill and build up your confidence:
1). Admit your shortcomings calmly.
Do not try to flee from them or cover them. Face them bravely. {#blank#}2{#/blank#} Fight against them every day until the day when you could break away and conquer them.
2). Dress for self-confidence.
{#blank#}3{#/blank#} And therefore pay attention to your dress, display your unique physical advantages and exhibit your best image. In addition, on formal occasions such as a business conference or a wedding ceremony, elegant dressing contributes to building your confidence.
3). {#blank#}4{#/blank#}
You should break your routine that deals with the work passively. Concentrate your efforts immediately on overcoming it, because it will make your restless mind at ease and build your self-confidence.
4). Be positive.
Feel pity neither on yourself nor on others. If you are used to hating and accusing yourself, others would tend to do that and believe it. Instead, you should speak positively about yourself, your progress, and your bright future. {#blank#}5{#/blank#}
A. Don't judge a person by appearance. B. Build your confident vocabulary. C. Don't put off what you eventually have to do. D. Actually, true self-confidence is neither born nor acquired overnight. E. By doing so, you would encourage your growth in a positive direction. F. Then talk about them to a reliable mate, a friend or a family member. G. Your appearance could put you into embarrassment or increase your confidence. |
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