原式=115×(-16)×311×45,
=-(115×16×311×45),
=-225.
It took Andy two hours ____ his homework yesterday evening and I spent ____ mine. .
A.doing; less time finishing
B.doing; more time to finish
C.to do; more time to finish
D.to do; less time finishing
(2003,39)消费者权益保护法规定的保障安全权,是指消费者在购买使用商品和接受服务时,享有( )不受侵害的权利。
A.名誉
B.人格
C.健康
D.人身、财产