下列四个数中，属于负数的是[ ]
A.-1
B.0
C.-(-1)
D.2009
答案：A
He spends as much time as he can ______ English every day. [ ]
A. to practise speaking
B. to practise to speak
C. practise to speak
D. practising speaking
骨与关节结核主要继发于（）
A.消化道结核
B.泌尿系结核
C.肺结核
D.淋巴结核
E.胸膜结核
