题目：
用动词的适当形式填空。
1. He wants _______ (swim) in the pool.
2. He likes _______ (run ) in the morning.
3. They often go ______( see ) an action movie.
4. School usually ______(start) at 8:30 am and ______ (finish) at 4:30
pm.
5. Please ______( fill ) in the blanks.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A解析：彩色多普勒是以红细胞运动速度为基础，用彩色信号对血流进行显像的技术。
