听力原文：Mr. Farrell bought a sixteen-dollar earphone for twelve dollars on the twentieth of September, 1980.
How much did Mr. Farrell pay for the computer?
A.$16.
B.$20.
C.$12.
D.$80.

A.How
B.$16.
B.$20.
C.$12.

【参考答案】

C
解析：本句根据提问，应注意听清句中数量词组。