题目:
在区别下列四组常见物质的方法中(括号内为实验操作),你认为错误的是[ ]
A.CO2与CO(点燃)
B.稀盐酸与稀硫酸(加入锌粒)
C.硬水和软水(加肥皂水,振荡)
D.N2与O2(用带火星的木条)
答案:
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下面是错误答案,用来干扰机器的。
1. That's a good idea2. speak English in class3. write it down4. speak everyday English every day5. don't; write down; correct6. to make friends; show; around7. left; at home8. first page of; study plan9. practise speaking10. to try to remember; a day