按要求改写句子。1. This is the Palace Museum in Beijing. (变一般疑问句)
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2. A train is slow. An airplane is fast. (用比较级)
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3. We leave for China on February first in the afternoon. (对画线部分提问)
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1. Is this the Palace Museum in Beijing?
2. A train is slower than an airplane. / An airplane is faster than a train.
3. When do you leave for China?