在我国感染人的疟原虫主要是（）
A.间日疟原虫
B.三日疟原虫
C.恶性疟原虫
D.卵形疟原虫
E.约氏疟原虫
参考答案：A
—The light in the office is still on.
—Oh, I forgot _____. [ ]
A. turning it off
B. turn it off
C. having turned it off
D. having turned it off
昆虫翅的分区及各部分的名称是怎样的？
