木屋架椽条的配料长度为檩条间距的（）倍。

A、1

B、2

C、3

D、4

Speaker A: I’m going to the park with some friends for a barbecue on Sunday. Would you like to join us
Speaker B: （）。

A. Why not on Saturday You see, I have an important appointment on Sunday.

B. Thanks, but unfortunately I have to take my sister to the airport on Sunday.

C. That’s a wonderful idea. Barbecue is one of my favorites.

D. What preparation do you expect me to do for the barbecue