强直性脊柱炎患者一般不会出现（）
A.类风湿因子阳性
B.血沉增快
C.HLA-B27阳性
D.尿17-酮皮质激素增高
E.白细胞增高
参考答案：A
（1-x）10的二项展开式中，x的系数与x9的系数之差为：______．
—What _____ they _____ last weekend?
—They played computer games. [ ]
A. do; do
B. do; did
C. did; do
D. are; doing
