问题
判断题
试液呈酸性且无色、无味，则在NO3-、CI-、Br-、Ac-、NO2-中，NO2-可不必鉴定。
答案
参考答案：对
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试液呈酸性且无色、无味，则在NO3-、CI-、Br-、Ac-、NO2-中，NO2-可不必鉴定。
参考答案：对
| 完形填空，选择正确答案。 | |||
| The traffic lights are the 1___________ in every country. There are always 2___________ lights: red, yellow and 3___________. Red means " 4___________". Yellow means " Wait ", and green means " 5___________".
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