20．A．recalling

　　B．starting

　　C．blocking

　　D．holding

　　答案：C　考查动词辨析。根据下文中的“stopping negative thoughts and refusing to dwell

　　on(沉湎于)negative images”可知，block意为“阻碍”，与句中的“stop”和“refuse”意思相近，符合语境。故选C项。recall意为“回想”；start意为“开始”；hold意为“持有”，均与语境不符。

　　.语法填空

　　(2017·海口市调测)

　　John：I've been noticing recently quite a lot of black smoke coming out of the chimneys of that factory near our school. __1__ really pollutes the air here.

　　Mary：Yes. But I heard recently that the __2__(own) of the factory have promised to take measures to reduce their factory's pollution.

　　John：I hope they will keep their promise.

　　Mary：I think they will. I've been told that

　　__3__ special machine is supposed to be fixed by the end of this year. It's said that the machine can clean the dust out of the smoke

　　__4__ it goes into the air.

　　John：That's good. Dust is really __5__(harm) to our lungs. I know that because my family lives near a steel factory with a chimney constantly __6__(pour) out black smoke.

　　Mary：Oh, you live near the steel factory? Is it true that we shouldn't eat the fish from the lake

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