补体系统各成分在炎症中的作用可归纳为________和________。
参考答案:促进炎症反应;协助消灭病原微生物
He told me that in the following days there were other changes, even more _________.
A.abrupt
B.changeable
C.suitable
D.typical
下图表示我国某地季节性积雪融化完毕日期等值线及水系分布。读图回答下列问题。
图中①、②、③、④四地积雪融化完毕日期最早的是()
A.①
B.②
C.③
D.④