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  3. In the past 12 months, Nigeria has suffered from a shrinking economy, a sliding currency, and a prolonged fuel shortage. Now, Af

In the past 12 months, Nigeria has suffered from a shrinking economy, a sliding currency, and a prolonged fuel shortage. Now, Af

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问题    In the past 12 months, Nigeria has suffered from a shrinking economy, a sliding currency, and a prolonged fuel shortage. Now, Africa’ s largest in facing a food crisis as major tomato fields have been destroyed by an insect, leading to a nationwide shortage and escalating prices.
   The insect, Tutaabsoluta, has destroyed 80% of farms in Kaduna, Nigeria’ s largest tomato producing state, leading the government there to declare a state of【C1】______. The insect, also known as the tomato leaf miner, devastates crops by 【C2】______ on fruits and digging into and moving through stalks. It 【C3】______ incredibly quickly, breeding up to 12 generations per year if conditions are favorable. It is believed to have【C4】______in South America in the early 1900s, and later spread to Europe before crossing over to sub-Saharan Africa.
   In Nigeria, where tomatoes are a staple of local diets, the insect’ s effects are devastating. Retail prices for a【C5】______of tomatoes at local markets have risen from $0.50 to $2.50. Farmers are reporting steep losses and a new $20 million tomato-paste factory has【C6】______production due to the shortages.
   Given the moth’ s ability also to attack crops like pepper and potatoes, Audu Ogbeh, Nigeria’s minister of agriculture, has warned that the pest may "create serious problems for food【C7】______" in the country. Ogbeh says experts are investigating how to control the pest’ s damage and prevent its spread, which has gone largely 【C8】______ until now.
   Despite being the continent’s second-largest producer of tomatoes, Nigeria is【C9】______on $1 billion worth of tomato-paste imports every year, as around 75% of the local harvest goes to waste thanks to a lack of proper storage facilities. A further【C10】______in local supplies is yet another unwelcome setback to the industry.
   A) dependent B) embarking C) emergency D) feeding
   E) grazes F) halted G) handful H) multitude
   I) originated J) reduction K) reproduces L) security
   M)terror N) unchecked O) unchecked
【C6】
选项
答案F
解析 根据助动词has可知，空格处所填单词应为动词过去分词，以构成现在完成时，因此halted“停止”符合题意。故选F。
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