1.D.第一段的最后那句有明显的说明。

2.D.'It’s polite to bring flowers, chocolates or a bottle of wine as a present.'一句是该题的出处。

3.A.正确理解'remember—not to ask how much things cost.'这句话才能得出答案。

4.C.仔细阅读短文第四自然段，就不难找到答案。

5.C.A、B、D三个选项在文中都有明确的说明。而根据'Before they take out their cigarettes after the meal, most people usually ask…'可以看出，抽烟前应当用'Do you mind if I smoke here?'这句话征求一下对方的意见。由此可将C项排除。hxw.red