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【单选题】
Why did critics complain that Gruen's 'shops were like mousetraps'?A.
Gruen designed his shops in a way capable of luring customers in.
B.
Gruen designed his shops with an appearance of mousetrap.
C.
Gruen's shops were famous for the mousetraps they sold.
D.
Gruen's shops sold things much more expensive than that of other ones.
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【简答题】设函数 ，其中a∈R。 （1）若a=1，f(x)的定义域为区间[0，3]，求f(x)的最大值和最小值； （2）若f(x)的定义域为区间（0，+∞），求a的取值范围，使f(x)在定义域内是单调减函数。