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问题 单项选择题

自然铜的炮制方法是( )

A．煅淬法
B．明煅法
C．暗煅法
D．提净法
E．水飞法

答案

参考答案：A

解析： 将药物按明煅法煅烧至红透后，立即投入规定的液体辅料中骤然冷却的方法称煅淬。自然铜炮制采用此法。

填空题

某温带草原里有鸟、昆虫、猫头鹰、蟾蜍和鼠、蛇等6种动物，它们相互间的关系如图，请据图回答问题：

（1）此生态系统有______条食物链．占有2个或2个以上的营养级的生物有______．

（2）若能量转化率为15%，那么流入猫头鹰体内能量最少的那条食物链是______．

（3）蛇和猫头鹰之间的关系是______．

（4）鼠和草在结构层次上的主要区别是______．
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单项选择题

In the dining room of my grandfather’ s house stood his heavy clock. Meals in the dining room were a (21) for our four generations to become one. My grandfather’ s clock always stood like a trusted old family friend, (22) us playing jokes and tellingstories, which was already a (23) of our life.

When I was a child, the old clock interested me. I watched and listened to it during (24) I was surprised how at (25) times of the day, the clock would strike three times, six times or more, with a wonderful great (26) that echoed throughout the house. The clock chimed year after year, a part of my (27) , a part of my heart.

Even more (28) to me was my grandfather’s special action each day. He meticulously (29) the clock with a special key each day. The key was magic to me. It (30) our family’ s magnificent clock ticking and striking all year round.

21（）

A.memories 

B.minds 

C.comfort 

D.information
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