阅读理解。

1. —Which is the cheapest(最便宜的)of  all?  

    —_______

A. Hat.    

B. T-shirt.        

C. Pants.        

D. Socks.

2. —How much are two sweaters and a hat?  

    —_______

A. $14.      

B. $20.          

C. $21.          

D. $22.

3. You can buy(买到)_______.

A. black pants  

B. a blue sweater

C. a green hat

D. red socks

4. You like red and you only have $6. You can take_______.

A. a sweater    

B. a hat   

C. a T-shirt      

D. none(全无)

5. You only have sixteen dollars. You can buy_______.

A. a sweater and a pair of pants(裤子)

B. two T-shirts and a pair of socks

C. a sweater and two pairs of socks    

D. a sweater and two hats

联锁：为了保证行车安全，在信号机，（）及进路间建立的相互制约的关系.