透明血栓的主要成分是
A．血小板＋纤维素
B．纤维素
C．血小板＋白细胞
D．白细胞＋纤维素
E．血小板＋红细胞
参考答案：B
—Who helped Li Lei with his English?
—______, he learnt it by himself.
A．Anybody
B．Somebody
C．Nobody
D．Everybody
浊流
