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Across Africa, the tsetse fly threatens a staggering 55 millions people and their 【M1】______ livestock. The insect sucks blood a
Across Africa, the tsetse fly threatens a staggering 55 millions people and their 【M1】______ livestock. The insect sucks blood a
admin
2017-12-25
81
问题
Across Africa, the tsetse fly threatens a staggering 55 millions people and their 【M1】______
livestock. The insect sucks blood and in doing so may pass on babies or the dead 【M2】______
parasite that causes trypanosomiasis, sometimes it known as sleeping sickness. 【M3】______
Infected animals suffer of poor growth, weight loss and low milk yield. They 【M4】______
may also become fertile and die. An estimated 5000,000 people are also affected 【M5】______
by the disease each year, and most of them die. Tsetse fly traps are a simple
but effect solution. They are built using blue cloth spread between three poles, 【M6】______
that looks like a cow to the hungry insect, while bottles containing a mixture 【M7】______
of cows’ urine and acetone are placed below. Attracted by the smell, the tsetse
fly settles on the cloth but is unable to get a bite and falls into the trap. One 【M8】______
tsetse fly trap cost only £20 to build but tests have shown that a single trap 【M9】______
will not work. For this reason it’s important that farmers build a number traps 【M10】______
across an area.
【M9】
选项
答案
cost一costs
解析
(此句话的主语one tsetse fly是单数形式,根据主谓一致原则,谓语也应该用单数形式。将cost改成costs。)
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本试题收录于:
B类竞赛(英语专业本科专科)题库大学生英语竞赛(NECCS)分类
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B类竞赛(英语专业本科专科)
大学生英语竞赛(NECCS)
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