10．Many of the teenagers don't stand straight，or sit correctly，which does not help to build their body．

分析 許多青少年站不直，或坐得不正確，這不能有助于發(fā)展他們的身體．

解答 答案：straight 考查首字母填空．根據(jù)句意及句子結(jié)構(gòu)，要填入副詞，straight意為"筆直地"，是副詞修飾動(dòng)詞stand．

點(diǎn)評(píng) 準(zhǔn)確地翻譯句子、理解句子，然后根據(jù)句意及提示完成句子，使句意更通順．

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