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  3. While most armies in the world shun their use, and military authorities exclude them from warfare, the technology to produce bio

While most armies in the world shun their use, and military authorities exclude them from warfare, the technology to produce bio

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问题     While most armies in the world shun their use, and military authorities exclude them from warfare, the technology to produce biological and chemical weapons is widely available around the world.【C1】______, these weapons are cheap, easy to conceal, and very【C2】______. Since September 11, 2001, biological weapons【C3】______to have become the weapon of choice among the desperate【C4】______of the world.  Some people are worried chemical warfare may【C5】______, which would bring an unbelievable disaster to the whole world.
    Chemical weapons are【C6】______in variety. Their effectiveness can be【C7】______by several factors, including age,【C8】______, weather conditions, and choice of  dissemination. They include nerve agents, blister agents, and choking agents, all of【C9】______can be ingested through the eyes, lungs, or skin. Satin, a type of nerve gas, was used【C10】______the Aum Shinrikyo cult in March 1995, killing 12 people and【C11】______more than 5,500 on a Tokyo subway.
    Biological weapons, by【C12】______, are any infectious agent, such as a bacterium or virus, used deliberately to【C13】______harm on soldiers and civilians alike. This【C14】______can include toxin and poison derived biologically. Biological weapons can be produced nearly【C15】______, from government labs to suburban kitchens.
    Experts contend, however, that the【C16】______of a deadly virus or bacterium into an effective weapon is anything【C17】______straightforward: A conventional bomb would likely destroy the germ as it【C18】______. In contrast, dissemination【C19】______alternative methods,  such as surface mail, has recently【C20】______quite effective.
【C1】
选项 A、Moreover
B、But
C、Therefore
D、Otherwise
答案A
解析 连词辨义题。文章开头第一句说明“虽然目前多数国家都避免使用生化武器，但是其制造技术却仍然随处可得”。下文作为补充又提到“生化武器造价便宜、容易藏匿。”可见两句构成的是递进关系。故选择Moreover“此外，而且”。but表转折；therefore表因果；otherwise意为“否则”，均不合句意。
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大学英语四级

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