Is Jenny skating?[ ]
A. Yes, Jenny is.
B. No, she is.
C. Yes, she is.
答案：C
—_________ is the bag?
—It's 7 dollars. [ ]
A. How many
B. How much
C. How old
几个不等值的电阻串联，每个电阻中流过的电流也不相等。
