A、 Gold was discovered in the city.
B、 The city's population grew to twelve thousand.
C、 The Golden Gate Bridge was constructed.
D、 Telegraph communications with the East were established.

【正确答案】 A

【答案解析】解析：短文说，在1848年发现金矿后，旧金山的人口增加到了1万人。因此选A。

A、 It is almost two million.
B、 It is almost three million.
C、 It is almost five million.
D、 It is almost six million.

【正确答案】 B

【答案解析】解析：短文提到，现在旧金山市的人口约300万。选B。

A、 It is one mile long.
B、 It cost 32 million dollars.
C、 It is the largest in the world.
D、 It was completed in 1936.

【正确答案】 B

【答案解析】解析：短文最后提到兴建金门大桥大约花了3200万美元。B正确。