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1. [单选题]Science is still ______ of the causes of many kinds of cancer.
A. ignorant
B. unconscious
C. conscious
D. informed
2. [单选题]According to the passage, the first settlers used wood for their utensils and tools because it was ______.
A. durable
B. inexpensive
C. available
D. attractive
3. [单选题]All the firemen in the city were ______to fight against the big fire.
A. called in
B. called off
C. called up
D. called on
4. [单选题]Tom: You are playing guitar well. Can you read music? Charles: No, I don't. I just listen to songs on the radio and then play them until they sound right. Tom: ______ Charles: No, really.
A. You're lying
B. You're cheating
C. You are boasting
D. You're kidding
5. [单选题]Guest: Oh, I hadn't realized how late it was. I'm afraid I'll have to be going. Host: Oh, not yet. I'm just going to make some coffee. Guest: ______ , though I'd really love to stay. I've got to be up by six tomorrow morning, unfortunately. Thank you for a wonderful party.
A. I'm sorry, but I must
B. Excuse me, but I have to go
C. Pardon me, but I should go
D. It's a pity, but no way out
