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问题 单项选择题

肌肤甲错，眼眶晦暗，多属

A．先天不足
B．后天失养
C．脏腑精气衰败
D．内有干血
E．肾精亏损

答案

参考答案：D

解析：若内有干血，不能润泽肌肤，则见肌肤甲错，兼眼眶晦暗。

解答题

市政公司为绿化一段万泉河沿岸风光，计划购买甲、乙两种树苗共500株，甲种树苗每株50元，乙种树苗每株80元．

（1）若购买树苗共用了28000元，求甲、乙两种树苗各多少株？

（2）若购买树苗的钱不超过34000元，应如何选购树苗？
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单项选择题

An engineer designed a ball so that when it was dropped, it rose with each bounce exactly one-half as high as it had fallen. The engineer dropped the ball from a 16-meter platform and caught it after it had traveled 46.5 meters. How many times did the ball bounce ？（）

A. 5

B. 6

C. 7

D. 8

E. 9
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