7．IsBobswimming（swim） now？

分析 Bob現(xiàn)在在游泳嗎？

解答 答案是Is，swimming．
本題考查語(yǔ)境中選用所給詞的恰當(dāng)形式；由題干中的now判斷句中需要現(xiàn)在進(jìn)行時(shí)"am/is/are+doing"，Bob為第三人稱單數(shù)，選用is；現(xiàn)在進(jìn)行時(shí)的一般疑問(wèn)句是將am/is/are 提到句首；故答案是Is，swimming．

點(diǎn)評(píng) 本題是要求用所給動(dòng)詞的適當(dāng)形式填空，解題時(shí)首先考慮句中需要的是謂語(yǔ)動(dòng)詞還是非謂語(yǔ)動(dòng)詞；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．

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科目：高中英語(yǔ) 來(lái)源： 題型：閱讀理解

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C．The scientists know why the vitamin can help fight PM2.5．
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