4．Last month，the researchers undertooka new project studying the effects of smoking on old people．

分析 上個月這些研究人員進(jìn)行了一項新的項目，研究吸煙對老人的影響．

解答 答案是undertook；本題考查語境中選用恰當(dāng)?shù)脑~的適當(dāng)形式． undertake承擔(dān)；承諾，undertake a project承擔(dān)一個項目；由last month判斷句中動詞需要過去時，故答案是undertook．

點評 首字母填空必須在對語境整體理解的基礎(chǔ)上抓住指向答案的關(guān)鍵線索、固定句型或搭配等，結(jié)合首字母選用恰當(dāng)?shù)脑~，同時注意所選詞的形式變化．

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