介绍： 1.
A) Britons.
B) Americans.
C) Austrians.
D) Australian.
2.
A) Poor people in the United States.
B) Rich people in the United States.
C) Poor people in Britain.
D) Rich people in Britain.

1. Who have more dental problems actually, according to a new study?
A) Britons.
B) Americans.
C) Austrians.
D) A...

介绍： 1.
A) Britons.
B) Americans.
C) Austrians.
D) Australian.
2.
A) Poor people in the United States.
B) Rich people in the United States.
C) Poor people in Britain.
D) Rich people in Britain.

1. Who have more dental problems actually, according to a new study?
A) Britons.
B) Americans.
C) Austrians.
D) Australian.

2. Who have the worst teeth?
A) Poor people in the United States.
B) Rich people in the United States.
C) Poor people in Britain.
D) Rich people in Britain.

答案：BA