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"am/is/are+doing",Bob為第三人稱單數(shù),選用is;現(xiàn)在進(jìn)行時的一般疑問句是將am/is/are 提到句首;故答案是Is,swimming.

點(diǎn)評 本題是要求用所給動詞的適當(dāng)形式填空,解題時首先考慮句中需要的是謂語動詞還是非謂語動詞;其次,如果是謂語動詞關(guān)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.

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B.The particles can lead to lung disease and heart attack.
C.The particles can cause blood disease and eye disease.
D.The particles can lead to heart attack and emotional diseases.
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A.Vitamin C can help reduce the bad impact of PM2.5.
B.PM2.5is actually not as dangerous as people expect.
C.The scientists know why the vitamin can help fight PM2.5.
D.More than half of the world's population suffer from PM2.5.
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A.Eggs.
B.Nuts.
C.Liver.
D.Apples.
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