血小板膜糖蛋白Ⅱb——Ⅲa的作用是

A．参与血块收缩

B．参与黏附反应

C．参与释放反应

D．参与聚集反应

E．参与凝血

Time was passing and we were getting       because we would have to spend the night in the cave if no one came to the rescue.

A．awkward

B．blank

C．desperate

D．breathless