4．The scientists are doing aresearch （研究） to find the reason of H7N9．

分析 科學(xué)家們正在做一項研究找出禽流感的原因．

解答 答案：research
通過觀察句子結(jié)構(gòu)可知此空在句中作賓語，要用名詞形式，結(jié)合空格前的不定冠詞a，可知該名詞為輔音音素開頭的，可數(shù)名詞的單數(shù)形式，根據(jù)漢語提示"研究"其英文表達(dá)為research，符合意思、語法正確，故填research．

點評 此類題目為給漢語型單詞拼寫題，完成此類題不僅要熟記單詞，注意拼讀規(guī)則，還要注意寫出的單詞在句中的句法功能，即要選用適當(dāng)?shù)脑~形．本題考查名詞．

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