情景选择。根据对话情景，从每题所给的三个选项中，选出最佳选项。
—Could I ask you some questions?
—______, go ahead.
A. No, you couldn’t B. Certainly C. Good idea
—My chest hurts . It’s difficult for me to breathe.
—______.
A.I’m sorry to hear that B. So careless  C. Never mind
—Would you like to be a greener person?
—______.
A. That’s all right  B. Certainly not  C. Sure, I’d love to
—How long have you been like this?
—______.
A. Last week B. Once a week  C. Since last week
—You study English so well!
—______.
A. Don’t say that B. Thank you C. No, I don’t.