问题
选择题
Tom went to open the door.________, his father began to wash dishes.[ ]
A. However
B. Nevertheless
C. Besides
D. Meanwhile
答案
答案：D
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Tom went to open the door.________, his father began to wash dishes.[ ]
A. However
B. Nevertheless
C. Besides
D. Meanwhile
答案：D
下列各组中所选鉴别试剂正确的是（ ）
| 待鉴别物质 | 鉴别试剂 | |
| A | Zn Fe | MgCl2溶液 |
| B | HCl溶液 H2SO4溶液 | BaCl2溶液 |
| C | KOH溶液 Ba（OH）2溶液 | Na2SO4溶液 |
| D | K2SO4溶液 BaCl2溶液 | Cu（OH）2 |
A．A
B．B
C．C
D．D
