关于强弱电解质及非电解质的组合完全正确的是
| A | B | C | D | |
| 强电解质 | NaCl | H2SO4 | CaCO3 | HNO3 |
| 弱电解质 | HF | BaSO4 | HClO | CH3COOH |
| 非电解质 | Cl2 | CS2 | 盐酸 | SO2 |
答案：D
题目分析：A选项中Cl2既不是电解质也不是非电解质。B选项中硫酸钡为强电解质。C选项中盐酸为混合物，既不是电解质也不是非电解质。D选项正确。
It is interesting to visit another country, but there are some problems when you don’t know the 31 very well. It may be 32 to talk with the people there. We may not know how to use the telephone in the country that we are visiting. We may not know how to buy 33 we need. In a 34 country we might not know where to eat or what to order in a 35 . It is not easy to decide how 36 to tip waiters or taxi drivers. When we need help, we might not know how to ask for help. It is not pleasant to have an experience 37 that. 38 a short time, however, we learn what to do and what to 39 . We learn to enjoy life in another country and then we may be 40 to leave.
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