I
How are you?____
What color are your shoes?____
Is your cap on the desk?____
Does your friend have long black hair? ____
What’s wrong with you?____
| II
A. Yes, it is.
B. I can’t find my keys.
C. Yes, she does.
D. No, I am not.
E. They are black.
F. How are you?
G. Fine, thank you |
的前n项和为
，且
=
，则
=（ ）