请阅读Passage l。完成第21—25小题。Passage 1Its one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect che

A、Toxoplasma gondii causes people strange and deadly diseases. B、With certain infection the infectious disease cannot be cured completely. C、Human beings infected by toxoplasma gondii will have permanent brain damage. D、Toxoplasma gondii is harmful to human beings, but it does no harm to mice.

时间:2024-04-12 10:02:52

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