意性炎症时，下列哪一种变化首先发生：
A．白细胞变性崩解
B．血流缓慢以至停滞
C．吞噬作用
D．白细胞附壁
E．白细胞游出
参考答案：B
—What did you do during your summer holiday?
—I spent my holiday _____ English in summer classes.
A. improving B. improves C. to improve
简述纳税申报的具体要求。
