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，因為它是可調(diào)節(jié)的．

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

點評 本題是要求用所給詞的適當形式填空，解題時首先考慮句中需要的詞性；其次，如果是謂語動詞關注時態(tài)、語態(tài)和數(shù)的變化；如果是非謂語動詞要聯(lián)系非謂語的基本用法判斷非謂語的形式；如果是名詞關注單復數(shù)．

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