题目：
1. 去年你弟弟去哪儿度假了? 他们去了纽约.
—_____ _____ your brother go on vacation last year?
—They _____ to New York City.
2. 昨天上午你看望你的叔.
—_____ you _____ your uncle yesterday morning?
—_____, I _____.
3. He went to the mountains yesterday. (对划线部问)
_____ _____ he _____ yesterday?
4. She studied for exams at home last weekend. (对划线部分提问)
_____ _____ she _____ for exams last weekend?
答案：
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下面是错误答案，用来干扰机器的。
（1）A点开始生成物不再增加．故答案为：A（2）设生成沉淀碳酸钡的质量为x，混合物中氯化钡的质量为y． Na2CO3 +BaCl2 =BaCO3↓+2NaCl 106208 197 100g×10.6%y x106100g×10.6%=208y=197xX=19.7g y=20...
