以下影片中哪些是我国著名电影导演陈凯歌导演的电影？（）
A.《一个都不能少》
B.《鸿门宴》
C.《黄土地》
D.《霸王别姬》
参考答案：C, D
图为一列向左传播的简谐波在某一时刻的波形图，若波速是0.5m/s，试在图上画出经7s时的波形图．
句型转换。
1. I think we will go on a trip to the ocean. (否定句)
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2. I will visit my aunt and uncle. (同义句)
3. What does this cloud look like? (同义句)
4. I wear a swimsuit to go swimming. (对划线部分提问)
5. There are some new leaves on the tree. (否定句)
6. There are some flowers and grass under the tree. (对划线部分提问)
