—I missed the beginning of ________ cartoon The Lion King.

---What a pity! You should leave school half _______ hour earlier.

A．a, an

B．the, a

C．the, an

D．an, the

关于疟疾的发病机制下列哪项正确（）

A.三日疟原虫侵袭各年龄的红细胞

B.恶性疟原虫主要侵袭衰老红细胞

C.间日疟与卵形疟原虫仅侵袭幼稚红细胞

D.血中带原虫的红细胞数量恶性疟原虫最少

E.三日疟原虫的红细胞内期裂体增殖多在内脏微血管内进行，易致内脏损害