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【单选题】
He's building a business in New Jersey by turning the half a ton of waste into _____.
A.
6,000 bottles of fertilizer
B.
a trade secret
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Under the plastic tent is a, would you believe, a _____ built of worm waste.
A.
contraption
B.
gold mine
【单选题】Szaky and his partner took a big risk by _____.
A.
dropping out of Princeton to start his business
B.
borrowing a lot of money