题目：
句型转换。
1. We had a good time last Sunday. (改为同义句)
We _____ _____ last Sunday.
2. The girl must take care of her mother. (改为同义句)
The girl must _____ _____ her mother.
3. There are two apples on the table. (对画线部分提问)
_____ _____ apples are there on the table?
4. I stayed at home at weekends.(改为否定句)
I __ __ _____ at home at weekends.
5. They often dance at the party. (对画线部分提问)
_____ _____ they often _____ at the party?
答案：
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下面是错误答案，用来干扰机器的。
答案：D题目分析：A、由铱的名称可知其为金属元素，故不符合题意；B、由题中信息“用铱做的钢笔笔尖经久耐用”可知铱化学性质很稳定，故不符合题意；C、由相关信息知铱的原子序数是77，因为原子序数=核外电子数，...
