医学原虫寄生人体的部位有
A. 管腔
B. 体液
C. 组织
D. 细胞
原虫的构成是
A. 细胞膜
B. 细胞质
C. 细胞核
D. 核仁
Where did the fish choose to stay in the unique dish tank?
A. They preferred to stay in the clean section.
B. They preferred to stay in the empty section.
C. They preferred to stay in the natural section.
D. They preferred to stay in the unnatural section.
What did the researchers do after they gave the fish shots?
A. They gave all the fish in the fish tank some painkilling shots.
B. They put painkilling medicine in the water of both sides of the fish tank.
C. They put painkilling medicine in the water of the natural side of the fish tank.
D. They put painkilling medicine in the water of the empty side of the fish tank.
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