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下列各句中，没有语病的一句是（）
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Some years ago，Chinese high school students would show their new school bags，new clothes or new pens to their classmates when the new term started.Today，however，all have l6、（） If you still come back to school l7、（） 0nly these things，you are out—of-date（过时的）。Students in big cities like to bring the latest high.tech things to school，and feel happy and 18、（） to show off（炫耀）these things to 19、（）.Mobile phones，MP3 players，CD players，electronic dictionaries，the list is endless.Young people think that.1iving in the 21 st century，they must keep up with the 20、（） They don’t want to fall 21、（）.Besides，they think 22、（）they need to keep in touch with their classmates.SO they need mobile phones.They also like to 23、（）the pop music，SO they need CD players.They explain that，24、（）like electronic dictionarjes，these can be 25 in their study，26、（）.They think that their parents should understand 27、（）they want these things.Foreign students will also bring some latest high-tech things when they 28、（） to school at the beginning of a new term.29、（），they often use the money which they made by themselves during the holiday to 30、（）these high—tech things that they want. 22、（）
在相距4k米的A、B两地，听到炮弹爆炸声的时间相差2秒，若声速每秒k米，则爆炸地点P必在（）。
教育的心理起源说的代表人物是（）
为了促进错误概念转变，下列哪一项不是必要环节（）
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