题目

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。Perhaps the biggest difference is in the growth of computers. Computers can think, remember and calculate faster than any human brain. A computer can hold more than a billion facts in its memory. There are computers that are so big that they would fill this entire auditorium with machinery. Business and banks are now managed by computers. Students’ grades, their marks are all managed by the computer, not from your teachers. In America we pay bills. We have to pay our children’s university study from a computer选修4-1：几何证明选讲如图，是圆的直径，是圆上两点，与相交于点，，是圆的切线，点在的延长线上，且．求证：（1）四点共圆；（2）．