单选题：Vitamins are complex ________ that the body requires in very

题目内容：

Vitamins are complex ________ that the body requires in very small mounts. A．matters
B．materials
C．particles
D．substances

参考答案：

答案解析：

Though ________ in a big city, Peter always prefers to paint

Though ________ in a big city, Peter always prefers to paint the primitive scene

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企业根据利用盈亏平衡点法，假设销售量无法达到盈亏平衡点产量的情况下，还可以通过（）方法，使得企业不至于亏损。A．降低单位商品变动成本 B．降低固定成本 C．适

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FreeplayhasbeenintroducedinsomeJapanesekindergartensinorderto（　　）.A．broadenchild

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