题目

— ________ the little girl looks!— That's true. She can't find her Teddy Bear. A . How sad B . What sad C . What sadly D . How sadly 答案：A如果a＞0，b＜0，用“＞”号将a+b，a-b，a连接起来a-b＞a＞a+ba-b＞a＞a+b．