若函数y=f（x）的图象与函数g（x）=3x+1的图象关于y轴对称，则函_爱下问搜题

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问题选择题

若函数y=f（x）的图象与函数g（x）=3^x+1的图象关于y轴对称，则函数f（x）的表达式为（　　）．

A．f（x）=-3^x-1

B．f（x）=3^x-1

C．f（x）=-3^-x+1

D．f（x）=3^-x+1

答案

∵函数y=f（x）的图象与函数g（x）=3^x+1的图象关于y轴对称，则有

f（x）=g（-x）=3^-x+1．

∴函数f（x）的表达式为f（x）=3^-x+1．

故选D．

补全对话，情景问答

A. Please ask that girl.
B. Which bus shall I take?
C. I don't know.
D. Is it far from here?
E. Can I take a bus to get there?
F. It's my pleasure.
G. Don't thank goodness.

A: Excuse me, sir. Could you please tell me how to get to the zoo?
B: Sorry, (1)_____ I'm new here. (2)_____
A: Excuse me, could you tell me the way to the zoo?
C: Go along this street until you reach the second traffic lights, then turn left.
At the end of the street, you'll see the zoo.
A: (3)_____
C: Yes, you can.
A: (4)_____
C: You can take the No.6 bus.
A: Thank you very much.
C: (5)_____

选择题

在下列这些药品中属于抗生素的是

A．碘酒

B．阿司匹林

C．青霉素

D．抗酸药