—I since I was 11. Now I am thinking about picking it up again.
—Good for you!
A:wasn't painting
B:haven't painted
C:didn't paint
D:won 't paint
①供不应求使商品价格高于价值
②我国居民以享受资料消费为主
③家庭收入是消费的基础和前提
④商品是使用价值与价值的统一
解方程:x+7-x=1.
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(按从左到右的顺序填写)
用所给词的适当形式填空