AIDS患者痰液中常可见到的寄生虫是()
A.阿米巴原虫
B.卡氏肺孢子虫
C.细粒棘球蚴虫
D.多房棘球蚴虫
E.卫氏并殖吸虫
参考答案:B
She was surprised to find the fridge empty; the child _____ everything!
A.had been eating
B.had eaten
C.have eaten
D.have been eating
肺泡与血液的气体交换能使肺泡中的氧气进入血液,这个过程的实现是由于
A.膈肌的收缩和舒张
B.白细胞可以变形运动
C.血红蛋白的特性
D.肋间肌的收缩和舒张