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  3. 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

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.
【C12】
选项 A、against
B、off
C、behind
D、through
答案A
解析 本题空格所在部分为第四段首句，The one thing going________them is price (对它们________的一件事情是价格)，冒号之后的部分是对这一部分的解释说明：昆虫蛋白的价格比鱼粉高出2到3倍，比大豆更是高出很多倍。前文第三段说明的是昆虫饲料的好处：需要的土地和水很少，用农业副产品和食物垃圾就可以喂养，是天然的动物饲料。从这里可以看出，前后文形成对比，此处要说明昆虫饲料的劣势，所以四个选项中，只有against满足该语境，故答案为A项。BD两项代入原文，分别构成go off(离开；爆炸)和go through(检查；通过)，不符合上下文语境；go behind不是固定搭配短语，behind代入原文也不符合语境，故全部排除。
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