四六级考试

【单选题】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、 (67) , these weapons are cheap, easy to conceal, and very (68) . Since September 11, 2001, biological weapons (69) to have become the weapon of choice among the desperate (70) of the worlD、 Some people are worried chemical warfare may (71) , which would bring an unbelievable disaster to the whole worlD、
Chemical weapons are (72) in variety. Their effectiveness can be (73) by several factors, including age, (74) , weather conditions, and choice of dissemination. They include nerve agents, blister agents, and choking agents, all of (75) can be ingested through the eyes, lungs, or skin. Satin, a type of nerve gas, was used (76) theAum Shinrikyo cult in March 1995, killing 12 people and (77) more than 5,500 on a Tokyo subway.
Biological weapons, by (78) , are any infectious agent, such as a bacterium or virus, used deliberately to (79) harm on soldiers and civilians alike. This (80) can include toxin and poison derived biologically.Biological weapons can be produced nearly (81) , from government labs to suburban kitchens.
Experts contend, however, that the (82) of a deadly virus or bacterium into an effective weapon is anything (83) straightforward:A、conventional bomb would likely destroy the germ as it (84) . In contrast, dissemination (85) alternative methods, such as surface mail, has recently (86) quite effective.
A．pretended
B．provoked
C．proved
D．provided

网考网参考答案：C
网考网解析：
[精解] 动词辨义题。该句意在表达：生化武器通过普通邮件的传播方式近期被证实相当有效。“被证实”应选用动词prove。pretend意为“假装”；provoke意为“刺激，激起”；provide意为“提供”，均不合适。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>