问题
选择题
下列描述中正确的是（ ）
A．电解法制镁时一般是用熔融态的氯化镁进行电解，但也可用氯化镁溶液
B．电解法生产铝时，可用钢网代替碳棒作阳极增大接触面积
C．我国第五套人民币中的一元硬币材料为钢芯镀镍，在硬币制作时，钢芯应做阴极
D．用电解法制备高纯度的镍，粗镍做阴极，精镍作阳极，阳极质量的减少与阴极质量的增加相等
答案
答案：C
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下列描述中正确的是（ ）
A．电解法制镁时一般是用熔融态的氯化镁进行电解，但也可用氯化镁溶液
B．电解法生产铝时，可用钢网代替碳棒作阳极增大接触面积
C．我国第五套人民币中的一元硬币材料为钢芯镀镍，在硬币制作时，钢芯应做阴极
D．用电解法制备高纯度的镍，粗镍做阴极，精镍作阳极，阳极质量的减少与阴极质量的增加相等
答案：C
| 完形填空 | ||||
| Free to Fly with the Wind One windy sprind day,I observed young people having fun by flying their kites in the wind.Colorful 1 of varying shapes and sizes filled the blue and clean skies like beautiful birds 2 . As the strong winds blew against the kites,a 3 kept them in control. Instead of blowing away with the wind,they went up against it to achieve great 4 .They shook and pulled,but the control string and the long tail kept them under 5 , facing upward and against the 6 . As the kites struggled and trembled against the string,they seemed to be saying,"Let me go!Let me go!I want to be 7 !"They flew beautifully even as they fought the control of the string.Finally,one of the kites 8 in breaking loose."Free at last,"it seemed to be saying,"Free to fly with the wind." Yet freedom from control simply put it at the 9 of an unsympathetic wind.It 10 ungracefully to the ground and landed in a wild mass of weeds."Free at last"-free to 11 powerlessly in the dirt,and to be blown 12 along the ground... How we are like kites sometimes!The Heaven gives us adversities(逆境),limits and rules to 13 from which we can grow and gain strength.Control is a 14 opponent to the winds of opposition.We can never go up high enough to achieve our goals sometimes if we lose our necessary 15 or the rules. | ||||
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