肺炎链球菌肺炎常发生于有基础疾病者如（）。
A.血液病
B.艾滋病
C.糖尿病
D.高血压
E.肝病
参考答案：A, B, C, E
函数y=ax+2（a＞0，且a≠1）的图象经过的定点坐标是 [ ]
A.（0，1）
B.（2，1）
C.（-2，0）
D.（-2，1）
The number of people invited __________fifty, but a number of them__________ absent for different reasons.
A．were; was
B．was; was
C．was; were
D．were; were
