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I failed in the exam. But my mother ___ me to try again.

A. keeps moving B. kept encouraging

C. kept stopping D. keeps making

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Life is full of surprises and you never know how things will turn out .

Sir John Gurdon is a good example of this. As a boy, he was told he was hopeless at science and finished bottom of his class. Now, aged 79, the very same Gurdon shared the 2012 Nobe Prize in Medicine with Japanese stem cell(干細胞) researcher Shinya Yamanaka.

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“My own belief is that we will, in the end, understand everything about how cells actually work,” Gurdon said.

In 1962, Gurdon took a cell from an adult frog and moved its genetic(基因的)information into an egg cell. The egg cell then grew into a clone(克隆) of the adult frog. This technique later helped to create Dolly the sheep in 1996, the first cloned mammal(哺乳動物)in the world.

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B. Shiny a Yamanaka.

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D. How to know cells actually work.

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