问题
单项选择题
关于疟疾的免疫和发病原理，下列哪项是错误的()
A．人群对疟疾普遍易感
B．感染疟原虫后免疫力产生很慢，维持时间不长
C．疟疾多次发作获得免疫力后，血中疟原虫完全消失，发作自行停止
D．疟疾反复发作或重复感染后获得一定免疫
E．感染间日疟原虫后不能与其他疟原虫之间产生交叉免疫
答案
参考答案：C
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关于疟疾的免疫和发病原理，下列哪项是错误的()
A．人群对疟疾普遍易感
B．感染疟原虫后免疫力产生很慢，维持时间不长
C．疟疾多次发作获得免疫力后，血中疟原虫完全消失，发作自行停止
D．疟疾反复发作或重复感染后获得一定免疫
E．感染间日疟原虫后不能与其他疟原虫之间产生交叉免疫
参考答案：C
My name is David. I live in a big house with my . Our house not near a city. It is twenty kilometers (公里） the nearest (最近的）city. There are people in my family. I live with my parents, my two sisters my brother. Our house has two floors. There a living room, four bedrooms, a dining room, a kitchen and two . I share a bedroom _ my brother, Simon. Each of my two sisters a bedroom. Our house has a big garden _ lots of flowers. I like in the garden with my brother and . At weekends my school friends come to see me. We play in the garden. it rains, we play in the room. Our home is a nice place live in. I have with my friends and family in our house.
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