单项选择题

Dog acts as the definitive hosts of Toxoplasma gondii.

A.正确
B.错误
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单项选择题
One Cryptosporidium oocyst cannot cause an effective infection.
A.正确
B.错误
单项选择题
There are no effective drugs for cryptosporidiosis, and it can only be symptomatically treated.
A.正确
B.错误
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