《大汉天子》是近几年的一部热播电视剧， “大汉天子”为推进我_爱下问搜题

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问题

《大汉天子》是近几年的一部热播电视剧， “大汉天子”为推进我国大一统格局做出了重要贡献。在加强中央对地方的控制方面，他采取的最重要一项措施是

A．设司隶校尉

B．实行“推恩令”

C．北击匈奴

D．“罢黜百家，独尊儒术”

答案

答案：B

本题考查的是汉武帝巩固中央集权的措施。汉武帝在加强中央对地方的控制方面，他采取的最重要一项措施是实行“推恩令”，故选B。

阅读理解

A Simple Scientific Experiment

Below is a description of a single scientific experiment. It shows us how iron reacts ( 反应) with air and with water.
Aim : To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c) in ordinary water.
Materials : 3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner.

Iron in dry air
Method
(1)Put some iron nails at the bottom of a test tube.
(2)Push some cotton wool down the tube.
(3)Leave the tube for one week.
Result
After one week, the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
(1)Half-fill a test tube with water.
(2)Boil the water for three minutes. (This makes sure there is no air in the water.
(3)Put two or three clean nails in the water.

(4)Add some oil to the water. (This will keep air out of the water.)
(5) Leave the tube for one week.
Result
The nails do not rust in the tube with air-free water.
Conclusion
Iron does not rust in air- free water.
Iron in ordinary water
Method
(1)Half –fill a test tube with water and add two or three clean nails.
(2)Leave the tube for one week.
Result
The nails rust in the tube with ordinary water.
Conclusion
Iron rusts in ordinary water. (238 words)

小题1:In the first part of the experiment the cotton wool is most probably used to ______________.

A．keep the air dry	B．keep the tube wet
C．make the nails rust	D．keep the tube clean

小题2:What are necessary steps to make sure the water in the tube is air free?
①Leave half a tube of water in it
②Boil the water for some time
③Put some clean iron nails in the tube
④Add some oil to the water

小题3:We can conclude from the experiment that only ____________ makes iron rusty.

B．cotton wool

C．ordinary water

D．air-free water

填空题

抛物线y=2x²+8x+ｃ的顶点在x轴上，则ｃ= （）．