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【单选题】
下列有关基因工程及其应用的说法中,正确的是( )A.
可用限制酶切割烟草花叶病毒的核酸
B.
必须用相同限制酶处理目的基因和运载体
C.
DNA连接酶连接DNA片段形成磷酸二酯键
D.
运载体上不必须有标记基因
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【简答题】试比较进程间的低级通信工具与高级通信工具
【单选题】听力原文：M: What do you know about our new English teacher? W: It's said that he is a middle-aged man. And he is strict with students. M: Really? I prefer the former teacher to him. What's the man's opini...
A.
He is strict.
B.
He is a middle-aged man.
C.
The man likes the new teacher.
D.
The man doesn't like the new teacher.
【简答题】有意义学习的概念
【单选题】“Light travels faster than sound,” the teacher said.
A.
The teacher said that the light travels faster than the sound.
B.
The teacher said that the light travelled faster than the sound
C.
The teacher said that the light has travelled faster than sound.
D.
The teacher said that the light had travelled faster than sound.
【简答题】Check - in Requirements Passengers and their baggage must be checked in at least 45 minutes before departure for domestic flights and 60 minutes for international flights. Government - issued photo id...
【单选题】The teacher said, “What are you thinking about?”=The teacher asked me _______ thinking about.
A.
what were you
B.
what you were
C.
what I was
D.
what was I
【单选题】---My English teacher said I’m hard-working. ---Really? You’re _______.
A.
luck
B.
lucky
C.
luckily
D.
lucks
【单选题】'I wish you’d look at me when I'm trying to speak to you!' the teacher said .
A.
excitedly
B.
pleasantly
C.
hopefully
D.
angrily
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