问题
选择题
He gave me a book to _____.[ ]
A. take care
B. look at
C. look
D. look after
答案
答案：D
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He gave me a book to _____.[ ]
A. take care
B. look at
C. look
D. look after
答案：D
有A、B、C、D、E五瓶失去标签的无色溶液，分别是HCl、Na2CO3、NaOH、BaCl2和H2SO4溶液中的一种．右图是它们之间的相互反应的现象图（“-”表示该两物质间不反应或反应没有明显现象，“↓”表示该两种物质间反应有沉淀产生，“↑”表示该两种
物质间反应有气体生成）．
| A | B | C | D | E | |
| A | \ | ─ | ↓ | ─ | ↓ |
| B | ─ | \ | ─ | ─ | ↑ |
| C | ↓ | ─ | \ | ─ | ↑ |
| D | ─ | ─ | ─ | \ | ─ |
| E | ↓ | ↑ | ↑ | ─ | \ |
（2）写出A与C反应的化学方程式：______．