题目

单句改错: 每句只改一处错误。 删除：把多余的词用斜线(﹨)划掉。 增加：在缺词处加一个漏字符号(∧), 并在其下面写出该加的词。 修改：在错的词下划一横线, 并在该词下面写出修改后的词。 1.  Once you promise, you must keep your words. 2. He set a limit with the expenses of the trip. 3. It is rude of you to speak to Mom like that. I won’t have you speak to her like that again. 4. How fun it is to have an ice-cream on a hot summer day! 5. I’d just about given myself up for lost while I was spotted by a ship. 6. My p已知a=(3，1)，b=(sinθ，cosθ)，且a∥b，（1）求tanθ的值；（2）求2sin2θ+sinθcosθ-cos2θ的值．