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【单选题】
当51单片机允许外部中断1中断时，则中断允许寄存器值为( )。A.
0x84
B.
0x81
C.
0x82
D.
0x04
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【单选题】听力原文：W: Why are you so late? I've been waiting for more than half an hour. M: My bicycle had a flat tyre and I had to walk. Q: Why was the man delayed? (14)
A.
He was tired.
B.
His appointment was changed.
C.
He had a flat tyre.
D.
His bicycle was stolen.
【单选题】听力原文：M: I need to find a dentist. You're familiar with Dr. Joanna, do you recommend her? W: Well, I've been seen by her a few times. And the best I can say for her is she has interesting magazines in ...
A.
She's never been treated by Dr. Joanna.
B.
She's been sitting in the waiting room too long.
C.
Dr. Joanna isn't the very good choice.
D.
She'd like to recommend a magazine to the man.
【简答题】用 for 或 since填空。 1. He's been waiting for you ______ two hours. 2. John has been living here ______ 2008. 3. I've been staying in London ______two weeks. 4. Jack has been studying French ______ he wa...
【单选题】Part B Directions: You will hear four dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each ques...
A.
Cold.
B.
Very hot.
C.
Cooler than on the day of this conversation.
D.
Drier than on the day of this conversation.
【单选题】听力原文：M: Pardon me, madam, but can you tell me where I can find the line for concert tickets this Saturday? W: It's here. I'm waiting and so are all these people in front of me. M: I want to buy ticket...
A.
They are trying to call someone.
B.
They are attending a concert.
C.
They are waiting in line.
D.
They are canceling reservations.
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