A:± 43
B:± 34
C:± 35
D:± 53
(Ⅰ)求f(x)的最小正周期、零点;
(Ⅱ)求f(x)在区间 π24,3π4 上的最大值和最小值.
从方框内选择适当的句子补全对话,有两项多余。
A.What do you want to drink?
B.The drinks there are good, aren't they?
C.That's a good place to relax.
D.Why don't we get something to drink.?
E.It is always so crowded there.
F.I like the loud music there.
G.So where would you like to go. Amy?
A: I'm thirsty, Amy.
B: Me too.____
A: Yeah. Let's go to Kangle. I love the soft drinks there.
B: Oh, Sam... I don't like Kangle.
A: Why? ____
B: The drinks are nice. I just don't like its environment. ____ And the loud music makes me feel uncomfortable.
A: OK. ____
B: Let's go to Semi-island. The soft music there makes me feel relaxed.
A: Good idea! ____