假定某商品的需求函数为Qd=500-100*P,则()A、价格为1元时，需求量为40
题型：多项选择题
问题：
假定某商品的需求函数为Qd=500-100*P,则()
A、价格为1元时，需求量为400
B、价格为2元时，需求量为300
C、价格为3元时，需求量为200
D、价格为3元时，需求量为400
E、价格为4元时，需求量为100
题型：多项选择题
短文改错（共10小题；每小题1.5分，满分15分）
此题要求改正所给短文中的错误，对标有题号的每一行作出判断：如无错误，在该行右边的横线上划一个（√）；如有错误（每行只有一个错误）；则按下列情况改正：
此行多一词：把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。 此行错一词：在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
This is a story told by my father: “When
I was boy, 小题1:
the most exciting thing was when to celebrate the Spring 小题2:
Festival．My grandma was the best cooker in the world 小题3:
but could make the most delicious dishes．One time, I just 小题4:
couldn't wait for the Spring Festival dinner．As I was 小题5:
about take a piece from a cooked duck, I saw Grandma in 小题6:
the kitchen looking at me．Shake her head, she said, ‘It 小题7:
isn't a good time to do that, dear．' At once I apologize 小题8:
and controlled me at my best till the dinner started．You 小题9:
know, that was a dinner we had waited for several month．" 小题10:
