感染途径
参考答案:
经口感染(溶组织阿米巴、蛔虫、蛲虫、猪囊尾蚴),经皮肤感染(钩虫、血吸虫),经胎盘感染(弓形虫、疟原虫),经呼吸道感染(蛲虫),经输血感染(疟原虫)
构成人体的四种基本组织有______.
The boy is ______ than his brother.[ ]
A. confidenter
B. more confident
C. as confident
D. the most confident