Without the ‘ greenhouse effect’, the earth ____ be about thirty-three degrees Celsius cooler than it is.
A．shouldB．wouldC．willD．must
B

試題分析：考查虛擬語氣中的情態(tài)動詞。本題是一個虛擬語氣，條件是通過介詞without（要不是…如果沒有…）體現(xiàn)出來的，句意：要不是“溫室效應(yīng)”的影響，地球的溫度會比現(xiàn)在要低30華氏度。CD兩項不能用與虛擬語氣。本句的would表示會；should表示應(yīng)該；故B正確。
點評：在虛擬語氣中要注意四個情態(tài)動詞should, would, might, could都是指自己本身的意思。
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