在贸易保护主义思潮中，尤为突出的是美国对华贸易保护主义的急剧升温，美国贸易保护主义无助于消除其贸易逆差，美国这种做法违背了世贸组织的

①非歧视原则　                        

②市场准入原则 　

③公平竞争和公平贸易原则　            

④透明度原则

A．①②④

B．①③④

C．①②③

D．②③④

根据句意及所给汉语提示完成单词。

1. Mr. Liu is an _____ (经验) teacher. He has ways to make his class lively.

2. — Do you know where the Oriental Pearl _____ (塔) is?

    — Yes. It's in Shanghai.

3. Many people in Harbin like _____ (滑雪) in winter.

4. The fans _____ (鼓掌) and screamed when the famous singer appeared on the stage.

5. Overwork will do _____ (伤害) to your health.