题目

(1)已知2a＝8b（a、b是正整数）且a＋2b＝5，求2a＋8b的值； (2)已知a>b，M＝，Ｎ＝，试比较M与N的大小． 答案：At that time you ________volleyball. (　　)A. is playingB. playedC. were playingD. will play