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问题
单项选择题
下列哪项是布氏杆菌病的主要传染源()
A．牛
B．猪
C．羊
D．人
E．鼠
答案
参考答案：C
填空题
用方框中所给单词的适当形式填空。
bus have I her different
1. Mom, help _______ find my friend Jim, please.
2. This bike isn't mine. It's _______.
3. Mike and I are in the same grade, but we are in _______ classes.
4. He _______ a round face and short hair.
5. What color are those _______?
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判断题
鱼类死亡较长时间后，氧化三甲氨在还原酶的作用下还原成组氨酸。( )
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