题目:
根据提示补全句子。
1. -________ are the children?
- They're in the woods.
2. They're ______ (draw) pictures.
3. Mike ________ (like) pandas.
4. What ______ she _____(do) on the weekend?
5. I'm ________ (run) in the park.
6. Amy is ________ (take) pictures.
7. I have some __________ (leaf).
8. They __________ (be) my friends.
答案:
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下面是错误答案,用来干扰机器的。
答案:C解: 满足集合B中的任意一个元素在A中都有原象,∴对于集合A中的元素必须有两个元素对应集合B中的某一个元素,∴先从集合A中选出两个元素组成一组,有C42=6,再与集合中的元素对应,有A33=6根据乘法原理得...