3．如图在Rt△ABC中，∠C=90°∠B=30°，AB=2，

　 则AC=　　 。

2．=　　　　 　。

1．在实数 ，，　 　， ， 　中是　　　　　 无理数 。

5. On the __________ to the shop, I picked a wallet.

Lesson 4

4. __________ your book and listen to me carefully.

( way / method )

3. It is time for the weather report, please __________ the radio.

( turn off / close )

2. Would you like __________ food to eat?

( turn on / open )

( some /any / little / a little )

1. Are there __________ letters for me?

5. After he arrived at the station, Mary __________ to meet him. ( hurry )

4. The clever boy can write down so many words with the book __________ . ( close )