Learning aims:
1. To master new words and expressions
2. key sentences:
It’s very difficult to depend on the weather in Britain because it changes a lat.
It is pleasant to visit Alaska in July and August but it might be cool in the evening.
自主学习：
首字母填空：
1. The sun is s_____ all day.
2. He bought a train ticket with a r____.
3. It is p______ for him to work out the problem because he is very clever.
4. Thee are many clouds in the sky, you’d better take an u___ with you.
5. The wind is too s___ for the old man to walk.
