不属于肉芽肿性炎的病变是
A．炎性息肉
B．慢性虫卵结节
C．结核结节
D．风湿，个体
E．硅结节
参考答案：E
They won’t go to the zoo because the price is too ________.
A．expensive
B．high
C．low
D．cheap
已知数列{an}中，Sn是数列{an}的前n项和，Sn=n2+2n+5，则数列{an}的通项an=______．
