沉井基础是用钢筋混凝土或（）制成的井箱式基础。
A.混凝土
B.预制的钢筋混凝土柱
C.工字钢
D.大口径钢管
参考答案：A
In the early morning, all of us stood at the top of the mountain to ________ east of the city, watching ________ burning sun rising.
A．the; a
B．/; a
C．the; the
D．the;/
丝及绢丝制女式其他服装
