48.A 细节理解题。根据第四段可知,声音的高低取决于凹槽的间距,因此正确答案为A。
49.C 词义猜测题。根据倒数第二段,并联系上下文可以推断,optimal在这里意为“最佳的,最理想的”,因此正确答案为C。
50.D 细节理解题。根据最后一段第一句话可以得出选项D正确。其余三项都与原文说法不符。
第二节
51-55 DBEGC
第三部分
第一节
Though great progress hav been made in science these years,there are still many people liv in poor conditions.They make their lives by collecting o selling used things.Their children cannot go to school because they ha not enough money to send their children there.Ho do you think so many people still suffer from poverty now?The answer lies o the population explosion.A president of a developing country once said,“It is u who are to blame for the poverty because we used to ‘produce’ chil without limit.” Although
few words sound simple enough,they have clea pointed out one of the causes of the population explosion.
第二节
One possible version:
Making Friends Selectively or Extensively?
When it comes to whether we should make friends selectively or extensively, there is no complete agreement among people. Some people take it for granted that we should make friends selectively and carefully. However, others maintain that making friends extensively should be regarded as the better choice.
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