题干
Which is ________, the moon or the earth?
A：big
B：bigger
C：the bigger
D：a little big
答案(点此获取答案解析）
B
Which is ________, the moon or the earth?
A：big
B：bigger
C：the bigger
D：a little big
，当
时，
，且满足下列条件:
②
, ③
．则
等于
