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【多选题】
一般而言,等产量曲线的特点()。A.
离原点越远的等产量曲线代表的产量水平越高
B.
任意两条等产量曲线都不会相交
C.
等产量曲线向右下方倾斜,斜率为负
D.
等产量曲线凹向原点
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反馈参考答案：
举一反三
【简答题】人创造自然环境,同样自然环境也创造人。
【单选题】His parents no longer worry about him. He has a good job and can live ______ now.
A.
of his own
B.
by his own
C.
on his own
D.
with his own
【单选题】He has a good job, but with six children his life is not a bed of ________.
A.
bamboo
B.
feathers
C.
apples
D.
roses
【简答题】Natural gas burns so cleanly that the owners of the natural-gas vehicles have ______.
【简答题】Кто он такой?这个问句的 正确解释
【单选题】His parents no longer worry about him. He has a good job and can live（）his own now.
A.
at
B.
by
C.
on
D.
with
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