⑴____A. cap B. Canada C. father
⑵____A. desk B. pencil C. seven
⑶____A. nine B. five C. kite
⑷____A. nose B. OK C. brother
⑸____A. under B. pupil C. fun
当CO和CO2两种物质所含氧元素的质量相等时,两种物质的质量比为 ____.
——_________ is he going to be after he leaves school?
——He's going to be a doctor.