1．Scientists have come to the conclusion ______the temperature on Earth is geiting higher  and higher．（　�。�
A．whatB．thatC．whichD．when

分析 句意：科學(xué)家們已經(jīng)得出結(jié)論，地球上的氣溫變得越來越高．

解答 答案B．
"______the temperature on Earth is geiting higher and higher"是conclusion的內(nèi)容，是同位語從句，并且這句話是完整的句子，不缺少任何成分，故用that來引導(dǎo)同位語從句．"what"在名詞性從句中做主語，賓語，表語；"which"表示哪一個；"when"表示時間．故選B

點評 本題考查同位語從句，要分析從句中句子的結(jié)構(gòu)和意思是否完整，才能選擇出正確選項．

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