D. hearts and long life

　　62. According to the text, the UK scientists have known that

　　A. women have more cells than men when they are born

　　B. women can replace the cells that enable the heart to beat

　　C. the female heart loses few of the cells with age

　　D. women never lose their pumping power with age

　　63. If you want to live longer, you should

　　A. enable your heart to beat much faster

　　B. find out the reason for ageing

　　C. exercise regularly to keep your heart healthy

　　D. prevent your cells from being lost

　　64. We can know from the passage that

　　A. the reason why ageing takes a greater loss on the male heart has been found out

　　B. scientists are on the way to finding out why the male heart loses more of the cells

　　C. the team has done something to prevent the male from suffering the greater loss

　　D. women over 70 could lose more heart cells than those at the age of 20

　　C

　　Unless we spend money to spot and prevent asteroids（小行星）now, one might crash into Earth and destroy life as we know it, say some scientists.

　　Asteroids are bigger versions of the meteoroids（流星）that race across the night sky. Most orbit the sun far from Earth and don't threaten us. But there are also thousands of asteroids whose orbits put them on a collision（碰撞）course with Earth.

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