超前锚杆支护宜采用缓凝砂浆作为锚杆支孔壁的胶结物，以适应围岩变形。( )
参考答案：错
I ______ English in that school since I came to the city. [ ]
A. have taught
B. am teaching
C. will teach
D. taught
深圳证券交易所规定，申购单位为( )股。
A．500
B．1000
C．100
D．5000
