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【单选题】
病原已被证明是典型的条件致病菌是( )。A.
河蟹颤抖病
B.
小瓜虫病
C.
蛙脑膜炎败血金黄杆菌病
D.
鱼类链球菌病
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举一反三
【简答题】达尔文的（）被恩格斯赞誉为（）世纪自然科学的三大发现之一。
【单选题】Between now and when you die,you will___more hours on work than you will on any other single activity.
A.
pay
B.
spend
C.
cost
D.
take
【单选题】There _________a book and three pens on my desk just now，but now there is nothing on it.
A.
had
B.
were
C.
was
【单选题】听力原文：M: Robin, what's the time now? W: It's 8:00 now. M: Why do you still stay at home? W: I am not myself today. I'm afraid I can't go to school. How is Robin?
A.
Robin is busy.
B.
Robin is sick.
C.
Robin is very well.
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