Mary did not understand such sentences as “She is in blue today.” “You are yellow.” “ He has a green thumb.（大拇指）” “He has told a white lie.” and so on. . And she went to her teacher for help.
Mary: Mrs Smith, there is a color in each of these sentences. What do they mean?
Mrs Smith: In everyday English, Mary , blue sometimes means sad. Yellow means afraid. A person with a green thumb grows plants well. And a white lie is not a bad one.
Mary: Would you give me an example for a white lie?
Mrs Smith: Certainly. Now I give you some cake. In fact you don’t like it, but you won’t say it. Instead, you say, “No, thanks, I’m hungry.” That’s a white lie.
Mary: Oh, I see. Thank you very much..
Blue sometimes means sad and is ________ English.”

A．good	B．spoken
C．poor	D．useful

I don’t have a green thumb , so all my plants _________.

A．die off	B．grow well
C．look nice	D．are good

Tom is _______ to climb the tree. He’s yellow.

A．happy	B．clever
C．sad	D．afraid

He didn’t like me to know ________ of the accident . he told me a white lie.

A．the reason	B．the meaning
C．the answer	D．the true story

He is ________ today . His father is ill.

A．blue	B．yellow
C．green	D．white