将下列血液中的成分与其功能配对起来。
红细胞
____
A止血、加速凝血
白细胞
B吞噬病菌
血小板
C运送氧气和二氧化碳
血浆
D运载血细胞、运输养料和废物
—Too much homework has made me tired these days, Mr. Wang.
—That's true. But a small tree won't grow into a big tree it experiences lots of winds and rains.