D．gratefully

　　解析：根据上文．..“I didn’t see a crack，not even on top of it！”可知，Patti对于纪念碑没有被毁坏很感激。

　　答案：D

　　19．A.buy

　　B．plant

　　C．cut

　　D．paint

　　解析：根据下文．..many young trees...可知，朋友们承诺要帮助他们栽种更多的树。

　　答案：B

　　20．A.cured

　　B．learnt

　　C．remembered

　　D．ignored

　　解析：那些为国捐躯的人将永远被人们铭记。

　　答案：C

　　三、阅读理解

　　Doctors said the patients，who have blindness called RP, had regained“useful vision”just weeks after having a light­sensitive microchip put into the back of their eye.

　　The implant(移植物)，which imitates the natural method by which the eye gets light and sends messages to the brain，enabled the patients to distinguish black from white and see the rough outlines of objects.

　　Because the brain has to“relearn”how to see after years of total blindness，it is hoped that the patients’vision could continue to improve further as they continue to use the chip.

　　The technology can still be refined further and in future could be used to improve the sight of people with serious blindness.

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