解析　句意：我马上就认出了姐姐的笔迹。recognize“认出”；observe“观察”。

　　答案　D

　　18．A.when

　　B．that

　　C．then

　　D．this

　　解析　句意：直到“那时”我才意识到姐姐在过去的一个月里一直在记日记。

　　答案　C

　　19．A.keeping

　　B．writing

　　C．using

　　D．making

　　解析　keep a diary“记日记”。

　　答案　A

　　20．A.faced

　　B．separated

　　C．surrounded

　　D．blocked

　　解析　句意：即使大洋把我们隔开，此时我觉得她就在这儿。

　　答案　B

　　三、阅读理解

　　A段

　　There are various reasons why cancers appear to be on the increase. For one thing, though their sufferers are to be found in all age groups, cancers are particularly likely to attack persons in their middle and advanced years. Naturally, since people live longer these years, there are more cancer sufferers than before. Again, with better methods of diagnosis (诊断), doctors can more easily recognize cancerous growths that would formerly have passed unnoticed or that would have been wrongly diagnosed. It is also believed that certain habits and conditions of modem living, including heavy smoking and the pollution of the air, may leave people living in more cancer-causing conditions than before.

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