The word "operation" (Line 3, ParA 4) refers to （）.
A. sports activities
B. hunting
C. prey killing
D. domesticating animals
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就多数传染疾病而论，下列传染过程中哪一种最为多见
A. 显性感染
B. 隐性感染
C. 潜在性感染
D. 带菌状态
E. 带虫状态
维生素A缺乏病是以眼、皮肤改变的全身性疾病。( )
A. 对
B. 错
31（）
A. especially Latie
B. for example
C. therefore
D. not American
Questions 14-16 are based on the following passage. You now have 15 seconds to read Questions 14-16. What is not one of the bad effects of malaria
A. The malaria parasites will grow and divide in the kidney.
B. The red blood cells will then be invaded by the parasites which reproduce thousands of times later.
C. The parasites cause a person’ s body temperature to rise.
D. People with malaria may suffer kidney failure or loss of red blood cells.
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