19．My father likes the chair very much because it isadjustable（adjust）．

分析 我父親非常喜歡這把椅子，因?yàn)樗强烧{(diào)節(jié)的．

解答 答案是adjustable．
本題考查語(yǔ)境中選用所給詞的適當(dāng)形式．a(chǎn)djust vt．調(diào)節(jié)；使適應(yīng)；adjustable adj．可調(diào)節(jié)的；題干中需要的是動(dòng)詞is后的做表語(yǔ)的形容詞，故答案是adjustable．

點(diǎn)評(píng) 本題是要求用所給詞的適當(dāng)形式填空，解題時(shí)首先考慮句中需要的詞性；其次，如果是謂語(yǔ)動(dòng)詞關(guān)注時(shí)態(tài)、語(yǔ)態(tài)和數(shù)的變化；如果是非謂語(yǔ)動(dòng)詞要聯(lián)系非謂語(yǔ)的基本用法判斷非謂語(yǔ)的形式；如果是名詞關(guān)注單復(fù)數(shù)．

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