A. Become powerful assistance to.

　　B. Become a huge barrier to.

　　　C Speeded up the process of.

　　D. Played a less important role than.

　　3 What does the third paragraph mainly talk about?

　　　A. Why natural evolution happens so slowly.

　　　B. The way scientists adopt to have genetic defects repaired.

　　　C. The advantages of man-made evolution over natural evolution.

　　　D. How scientists make use of man-made evolution to create new species.

　　BDC

　　2016高考英语阅读理解集训阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。 After fighting cancer for 13 years, my grandfather became ill enough to be admitted to

　　hospital. One morning, he was having trouble breathing, but continued to silently hold my

　　hand. I kept forgetting his special request that grandpa wanted me to fetch a New Year card that my late grandmother had given him on their last anniversary together. He used the card as

　　a bookmark in his Bible.

　　I just knew that I had to fetch his much-loved and much-requested gift. Leaving my

　　grandpa at his bedside, I rushed home. Jumping back into my car with the card in my hand,

　　was depressed when the car wouldn't start. I quickly ran to the nearest bus stop. As I waited

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