2. 外语
  3. Organic farmers had fought to prevent genetically-engineered crops from being【C1】______organic, and it could【C2】______for them.

Organic farmers had fought to prevent genetically-engineered crops from being【C1】______organic, and it could【C2】______for them.

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问题     Organic farmers had fought to prevent genetically-engineered crops from being【C1】______organic, and it could【C2】______for them. Plants genetically【C3】______to resist insects and other pests【C4】______about 15-percent of United States crop production, but it has become a【C5】______15-percent. Several European countries are refusing to【C6】______genetically-engineered crops from the United States. Jim Skiff, president of the Illinois-based company U-S Soy, says his company will not grow crops with genetically modified organisms, known as G-M-O for short.
    But the biotechnology industry is fighting back.  Here’s an advertisement produced by the Washington-based Council for Biotechnology Information.  The biotech industry received a(n)
【C7】______in April,【C8】______a National Academy of Sciences report【C9】______that C-M-O crops appear to be safe. G-M-O supporters called the report proof【C10】______fears of these crops are【C11】______, while critics called the report proof that the【C12】______of G-M-O crops are not【C13】______known.
    Some companies are avoiding G-M-O crops in their products just to【C14】______the genetic-food fight【C15】______. Jim Schlesinger of Iowa-based Whole Soy says his【C16】______of soy-based foods will not include genetically-engineered beans. Agriculture officials in the Midwest United States say it appears famers are planting fewer【C17】______of G-M-O soybeans and corn this year, though they say this is probably a【C18】______situation until the controversy【C19】______. A survey conducted by the Food Marketing Institute suggests 63-percent of American【C20】______are likely to buy genetically-engineered foods. That is down from 77-percent four years ago.
【C8】
选项 A、until
B、whereas
C、when
D、unless
答案C
解析 根据主从句的逻辑关系，填入空格的连词应该引导时间状语从句。所以，when符合句意。
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