How long had the Great Wall existed before Qin Shihuang had it connected?
A.400 years.
B.500 years.
C.1000 years.
D.2 200 years.

A.400
B.
B.500
C.
C.1000
D.
D.2
E.

【参考答案】

A
本题为细节理解题。本文第四段表明，最古老的城墙修建于2600年前，秦始皇于2200年前让人们把长城连接了起来......

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