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各种管道不论直径大小，一律用粗实线表示，可用汉语拼音字头为代号表示管道类别。
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语言能力是在（ ）的过程中发展起来的。发展幼儿语言的关键是创造一个能使他们想说、敢说、喜欢说、有机会说并能得到积极应答的环境。
少数民族地区应该帮助幼儿学习本民族语言（）。
对有语言障碍的儿童一视同仁，不用顾忌他们的发展水平。
[音频]1. A) The majority of drivers prefer to drive and park themselves.B) Human drivers become easily distracted or tired while driving.C) Most drivers feel uncertain about the safety of self-driving cars.D) Most drivers have test driven cars with automatic braking features.2. A) Their drivers would feel safe after getting used to the automatic devices.B) They would be unpopular with drivers who only trust their own skills.C) Their increased comfort levels have boosted their sales.D) They are not actually as safe as automakers advertise.
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