You must use hiragana and katakana appropriately.

你适当地必须使用平假名和片假名。

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A phonetic sound can be expressed in both hiragana and katakana.

语音既可以用平假名也可以用片假名表示。

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C Hiragana and katakana have the same number of sounds and characters.

因此，恰当概括原文中心思想的选项c的内容是正确的。

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All the rest are katakana (except one that is all hiragana and another English), visual and esthetic evidence that these are new companies, generally in service and new technology sectors.

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