恶性疟原虫主要侵袭衰老红细胞，间日疟与卵形疟原虫仅侵袭幼稚红细胞。
参考答案：错
.
If we ________ earlier, we would have had trouble getting good seats.
A．didn’t arrive
B．haven’t arrived
C．hadn’t arrived
D．couldn’t arrive
亚急性甲状腺炎为自限性病程，预后良好，发生永久性甲减者罕见。
