It’s easy to scare people about what’s in their food, but the danger is almost never real. And the【C1】________itself kills.

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问题     It’s easy to scare people about what’s in their food, but the danger is almost never real. And the【C1】________itself kills.
    Take the panic【C2】________genetically modified organisms, or GMOs. Ninety percent of all corn grown in America is genetically modified now. That means it grew from a seed that scientists【C3】________by playing with its genes. The new genes may make corn grow faster, or they may make it less【C4】________to bugs so farmers can use【C5】________pest-killing chemicals.
    This【C6】________some people. GMOs are "unnatural," they say. A【C7】________from the movie "Seeds of Death" warns that eating GMOs "causes multiple organ system【C8】________."
    Michael Hansen of Consumer Reports sounds al-most as【C9】________when he talks about GMOs. He says, "You can’t control【C10】________you’re inserting that genetic information; it can have different effects【C11】________on the location."
    Jon Entine of Genetic Literacy Project responds: "We’ve eaten about 7 trillion meals in the 18 years【C12】________GMOs first came on the market. There’s not one documented instance of someone getting so【C13】________as a cough."
    Given all the fear from【C14】________and activists, you might be surprised to learn that most serious scientists【C15】________with him. "There have been about 2,000 studies," says Entine, and "there is no【C16】________of human harm in a major peer-reviewed journal."
    That might be enough to reassure people if they knew how widespread and familiar GMOs really are—but【C17】________they think of GMOs as something strange and new, they think more tests are needed.
    【C18】________people don’t worry about crops bred in【C19】________varieties for centuries without farmers having any idea exactly what genetic changes【C20】________  
【C17】

选项 A、as long as
B、even if
C、unless
D、in case

答案A

解析 由选项可知,本题应填入从句引导词。前半句“把转基因看成是奇怪的新鲜事物”是后半句“人们会觉得需要在这方面做更多的试验”的假设条件。因此空格处应填一个表示假设的条件状语从句引导词,A项as long as“如果,一旦”符合要求。B项even if“即使”表示让步,用于此并不能表明前后分句之间的逻辑关系,因此排除。C项unless“除非”代入空格,意思就跟本段首句相矛盾了,应排除。D项in case“以防”填入空格处。句意不通。
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