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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?shù)脑~的適當形式． undertake承擔；承諾，undertake a project承擔一個項目；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上抓住指向答案的關鍵線索、固定句型或搭配等，結合首字母選用恰當?shù)脑~，同時注意所選詞的形式變化．

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