—How are you feeling today?

—________ I think I can go to the picnic with you tomorrow.[ ]

A. Not too bad.

B. Much better.

C. Very bad.

D. Not so well.

在（）上有凹槽滚道，滚动体放在内外圈之间，并可沿凹槽滚动。

A.内圈外面

B.外圈内面

C.固定螺钉

D.保持架