杆件丧失了原有直线形状的稳定性,这类破坏称为丧失稳定性。
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The writer never gets up early on Sundays. _____________________.
A. He often gets up at 8 o'clock in the morning.
B. Sometimes he stays in bed until lunchtime.
C. He seldom stays in bed late.
D. He always stays in bed until lunchtime.
Last Sunday, it's raining again. "____________!" The writer thought.
A. It's a terrible day!
B. This is a terrible day!
C. What a terrible day!
D. What a beautiful day!
-________ had Lucy come to see the writer?-By train.
A. Which
B. How
C. Where
D. When
When Lucy arrived, she said _________________to see the writer.
A. she will come
B. she came
C. she would come
D. she's coming
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