----Thank you for your MP4 player. I’ll get Mary to take it to you soon. ----___________. I’ve bought a new one. A. No sense B. No hurry C. No way D. No use
— Are you sure the delegation will come to our school next week? — _____. The head of it has just emailed me about the departure time of their flight. A. No wonder.
的最小值是 .
=
=
+2≥2+2=4，当且仅当x=y时取“=”.