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问题
单项选择题
下列病中属于二类传染病的是( )。
A．仔猪白痢
B．禽流感
C．猪急性胃肠炎
D．狂犬病
E．牛流行热
答案
参考答案：D
填空题
Look at the pictures and complete the sentences.
1. What is she doing?
She_________. (dance)
2. What are they doing?
They ________. (swim)
3. What is the girl doing?
She _________. (cook)
4. What are they doing?
They _________(play)volleyball.
5. What is the girl doing?
She ________. (write)
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问答题 简答题
SS4改型机车控制电路由哪几部分组成？
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