所有国际旅行社都可以经营出境旅游业务和国内旅游业务。
参考答案：错
ou could ask the teacher for help.
________________ Teachers are always helpful.
A．I think so.
B．I disagree.
C．I am afraid not.
D．I don’t think so.
在考虑费用的监理评价中，工程越复杂越重要，则费用问题对决定取舍的影响越小。 ( )
