Roast (烧烤) is very famous in Brazil. Customs (顾客) just sit , waiting for waiters to send them all kinds of meat. If you like , you take one ; if you don’t , the waiters pass you . If you don’t give any messages of stopping , they will go on.
One day when I was in Brazil , I went to a restaurant to try the roast . After I took my seat, the waiter gave me a sign with the color “red” on the side and “green” on the other . I said “thank you”, then the waiters began to serve me .My plate was already full, but the waiters still kept on serving me more. I thought I had to eat more quickly . But to my surprise, the waiters still kept on serving more. Then a waiter found out the reason. He helped me turn the sign over, with red outside . When I finished , I found the waiter didn’t take a look at me . Do you know Why? It’s just like the traffic lights in the street . How wonderful !
When did the waiters give me a sign?

A．After I went into the restaurant

B．When I sat down

C．When I tried the food

D．When my plate was full

When I began the meal , the color red was                .

A．inside	B．outside
C．not seen	D．not on the sign

How did the waiter know you wanted food?

A．Put the “green” side outside.

B．Take the sign away.

C．Put the “red” side outside.

D．Keep the waiters away.

Why didn’t the waiters serve me later ? Because                    .

A．I didn’t call them	B．I didn’t want more
C．the red was outside	D．they didn’t like me