2017年12月六级 第1套 Section A 选词填空

In the past 12 months, Nigeria has suffered from a shrinking economy, a sliding currency, and a prolonged fuel shortage. Now, Africa's largest economy is 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 __26__. The insect, also known as the tomato leaf miner, devastates crops by __27__ on fruits and digging into and moving through stalks. It __28__ incredibly quickly, breeding up to 12 generations per year if conditions are favorable. It is believed to have __29__ 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 __30__ 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 __31__ 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 __32__ " in the country. Ogbeh says experts are investigating how to control the pest's damage and prevent its spread, which has gone largely __33__ until now.

Despite being the continent's second-largest producer of tomatoes, Nigeria is __34__ 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 __35__ in local supplies is yet another unwelcome setback to the industry.