First it was pets, then fish. Now it’s poultry and pigs. The【C1】________of animals allowed to feed on insects is growing. A new

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问题 First it was pets, then fish. Now it’s poultry and pigs. The【C1】________of animals allowed to feed on insects is growing. A new EU law【C2】________the use of insect protein in poultry and pig feed came into【C3】________earlier this month, which is a significant【C4】________for an industry keen to【C5】________ its way into the animal-feed business.
【C6】________a ban on processed animal protein was imposed in 2001 in the【C7】________of the "mad cow" crisis, soy and fishmeal have become the bedrock of animal feed in Europe. But their production needs lots of space and can be【C8】________to the environment, so feed manufacturers are looking for【C9】________.
Insects are just the ticket. They are reared in vertical farms that require little land or water, and they can be fed on agricultural by-products or food waste【C10】________rotting fruit and vegetables. They’re also a natural【C11】________. Most wild fish, birds and pigs eat insects.
The one thing going【C12】________them is price: insect protein is two to three times more expensive than fishmeal, and many times pricier than soy. Scaling up production may help close the gap. Rabobank, a Dutch lender,【C13】________that global insect production will reach 500,000 tonnes a year by 2030, and that prices will tumble.
Insect companies have【C14】________hard on their pitch. Research suggests insects may be more than mere feed,【C15】________growth rates and immune systems as well as filling stomachs. They also offer the【C16】________of a green, local protein.
Poultry and pig feed are by far the largest animal-feed markets, but they’re more【C17】________ than food for pets or fish. For that reason, says Antoine Hubert, CEO of Ynsect, a mealworm firm, insect protein will probably be used only in premium meat at first.
This year the European Food Safety Agency has ruled that three【C18】________of insects (yellow mealworm, locusts and house crickets) are【C19】________for humans to eat as well.【C20】________. however, people seem less keen on the idea than chickens and pigs.
【C17】

选项 A、excessive
B、competitive
C、productive
D、sensitive

答案B

解析上文第四段提及昆虫饲料的缺点：价格相对高昂。本题空前说目前家禽和猪饲料的需求量最大，空后说“出于这个原因，昆虫蛋白质在起步阶段可能只用于优质肉类”，而空格处要填的词就是这个原因，将四个选项代入空格进行验证，只有competitive(竞争激烈的)符合语境，即虽然家禽和猪饲料需求量大，但市场竞争比宠物饲料或鱼饲料更为激烈，如果要使用昆虫蛋白，成本会很高，所以一开始昆虫蛋白只能用于优质肉类(售价高)。故答案为B项。A项excessive意思是“过度的”，C项productive意思是“多产的”，D项sensitive意思是“敏感的”，代入原文，均不符合语境，故排除。

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