受到（）力作用而发生运动的水流叫无压流。
A.重力
B.压力
C.摩擦力
D.向心力
参考答案：A
根据句意和首字母补全单词。
1. Mrs. Brown's cat is m________. She is very worried.
2. Lin Tao is looking for Gogo in the n________.
3. It's very cold outside, you'd better s________ in the room.
4. Tom gets up very late every day, so he goes to school w________ breakfast.
5. It's time for lunch, I f________ very hungry.
红斑作用
