13．Sitting too long before the computer is harmfulto people's health．

分析 在電腦前坐得太久對(duì)人們的健康有害．

解答 答案是harmful．本題考查語(yǔ)境中選用恰當(dāng)?shù)脑~或短語(yǔ)；harmful adj．有害的；be harmful to 對(duì)…有害的；故答案是harmful．

點(diǎn)評(píng) 首字母填空必須在對(duì)語(yǔ)境整體理解的基礎(chǔ)上抓住指向答案的關(guān)鍵線索、固定句型或搭配等，并聯(lián)系首字母，同時(shí)注意所選詞的形式變化．

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