在全球致死的寄生虫病中，下列哪种排第一位（）。
A.疟疾
B.血吸虫病
C.阿米巴虫病
D.黑热病
E.囊尾蚴病
参考答案：A
解析：疟疾经按蚊叮咬而感染疟原虫所引起的虫媒传染病。临床以周期性寒战、发热、头痛、出汗和贫血、脾肿大为特征。儿童发病率高，大都于夏秋季节流行。疟原虫寄生于人体所引起的传染病。经疟蚊叮咬或输入带疟原虫者的血液而感染。不同的疟原虫分别引起间日疟、三日疟、恶性疟及卵圆疟。本病主要表现为周期性规律发作，全身发冷、发热、多汗，长期多次发作后，可引起贫血和脾肿大。疟疾是由疟原虫引起的寄生虫病，于夏秋季发病较多。在热带及亚热带地区一年四季都可以发病，并且容易流行。
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| Anna lived on the side of a valley. One summer, there was a very big 1 , and a lot of houses down below Anna's were washed away. Anna's house was 2 enough to escape the flood, so when the water had 3 and the other houses were standing there 4 no roof and no walls and all covered with mud(泥), her house was just all right. Her house was quite small, her husband was dead, and she had four children, 5 Anna took in one of the families that had lost 6 in the flood and she 7 her home with them until it was 8 for them to rebuild their house. Anna's friends were 9 when they saw Anna do this. They could not understand why Anna wanted to give 10 so much more work and trouble when she already had quite a few children to 11 . "Well," Anna 12 her friends, "at the end of the First World War, a woman in the town where I then lived found herself very 13 , because her husband had been killed in the 14 and she had a lot of children, 15 I have now. The day before Christmas, this woman said to her children, 'We won't be able to have much for 16 this year, so I'm going to make only one present to all of us. Now I'll go and get it.' She came back with a 17 who was even poorer than they, and who had no parents. 'Here's our 18 ,' she said to her children. The children were 19 and happy to get such a present. They 20 the little girl, and she grew up as their sister. Such was that Christmas present." | ||||
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