∵a＞0，
∴|a|a=aa=1；
∵a＜0，
∴|a|a=-aa=-1．
某商品进价为800元，出售时价格为1200元，后来由于该商品积压，准备打折出售，但要保证利润不低于5％，你认为该商品至多可以打几折？
There _______ many new books in your room. But I _______ only one. [ ]
A. have; have
B. is; have
C. are; has
D. are; have
