洞庭湖位于湖南省北部，为我国第______大淡水湖，登岳阳楼可俯瞰洞庭湖，有“洞庭天下水，岳阳天下楼”之誉。
参考答案：二
从0～9这十个数中取出四个数组成电话号码，其首位不能为零。问共能组成多少个电话号码
-____
-They're English books.[ ]
A. Are these English books?
B. Are those English books?
C. How do you spell it?
D. What're these in English?
