10.China’s genetic engineering(基因工程) industry __________ in the late 1980s, two decades after some other countries.

    A. set off         B. set in          C. set to          D. set back

[能力拓展]

      完形填空:

I would like to suggest that for sixty to ninety minutes each evening all television broadcasting in the United states be forbidden by law.

   Let us take a   1   , reasonable look at what the results might be if such a(an)   2   were accepted: families might use the time for a real family hour. Without the distraction of TV, they might   3    together after dinner and actually talk to one another. It is well known that many of our   4   --everything in fact, from the generation gap to the high divorce rate to some forms of   5   illness-are caused at least in part by   6   to communicate. By using the quiet family hour to   7   our problems, we might get to know each other better, and to like each other better.

   On evening when such talk is   8   , families could discover more active pastimes(消遣,娱乐). Freed from TV, forced to find their own activities, they might take a   9   together to watch the sunset   10   they might take a walk together.   11   free time and no TV, children and adults might discover reading. There is more entertainment in   12   than in a TV program.   13    report that the generation growing up with television can hardly write an English sentence,   14   at the college level.   15   is often learned from reading. A more literate new generation could be a product of the quiet hour.

   A different   16   of reading might also be done as it was in the past: reading aloud. The quiet hour could become the story hour. When the   17   ends, the TV net works might be forced to   18   with better shows in order to get us back from our newly discovered activities.

   At first glance, this idea seems radical(激进的). How will we spend the time then? The fact is: it has been only twenty-five years   19    television came to control American free time. Those of us thirty-five and older can   20   childhoods without television. It wasn’t that difficult.

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