3. What effects are sandstorms bringing to people living in cities?

　　A. The whole city is usually covered by thick and yellow dust.

　　B. Traffic moves very slowly.

　　C. People can't breathe well and the dust make them ill.

　　D. All above.

　　4. What is the best way to avoid the effects from the sandstorm?

　　A. To live far away from deserts.

　　B. To stay at home when a sandstorm happens.

　　C. To wear mask if you want to go out.

　　D. To plant more trees.

　　5. Which of the following is not the elements to make Central Asia, North America, Central Africa and Australia the four main places where there are sandstorms?

　　A. The climate in these places is rather bad.

　　B. They are all the places with big deserts.

　　C. The natural environment in these places is worsening every year.

　　D. The governments in these places paid little attention to the protection of nature.

　　Suggested answers:

　　1. B　2. C　3. D　4. D　5. D

　　→ Step 2 Grammar 1

　　1. In this period we are going to talk about the infinitive.

　　(Show the following sentences on the screen if possible. )

　　Paraphrase them by using the infinitive.

　　1)The wind is strong enough. It can move sand dunes.

　　2)We were advised, "Don't go outside. "

　　3)I'm cycling to work in a sandstorm and it's frightening.

　　4)There is nothing anyone can do.

　　5)I am the only person in my family who has been in a sandstorm.

　　6)I've been caught in a sandstorm. It was a terrible experience.

　　Suggested answers:

　　1)The wind is strong enough to move sand dunes.

　　2)We were advised not to go outside.

　　3)It's frightening to be cycling to work in a sandstorm.

　　4)There is nothing to be done.

　　5)I am the only person in my family to have been in a sandstorm.

　　6)To have been caught in a sandstorm was a terrible experience.

　　2.Option One

　　Ask students to sum up the different types of infinitive.

　　Write the following on the blackboard.

　　形式时间概念语态

　　to do/do与谓语动词同时发生或发生在谓语动词之后主动