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【多选题】
农业设施内的有害气体有()A.
氨气
B.
二氧化氮
C.
乙烯
D.
二氧化碳
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反馈参考答案：
举一反三
【单选题】From the last paragraph, one may learn that an important reason for the high hidden costs for college students is______.
A.
the extremely high prices of daily necessities
B.
the school's overcharging for campus activities
C.
the too many expenses the students have to pay
D.
the pressure of keeping pace with their peers
【单选题】Hidden hotel costs can be a source of frustration to the frugal traveler.
A.
careful
B.
clever
C.
ignorant
D.
economical
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