15．"It seems as if there've been a lot of strong earthquakes this year．And no，it's not a signal _____ the planet is coming apart at the seams（縫隙）．"Scientists say．（　　）
A．whetherB．thatC．whatD．which

分析 科學(xué)家說："今年似乎發(fā)生了很多強(qiáng)烈的地震．不過這不是星球從縫隙來的信號(hào)．"

解答 答案：B．
此題it指代前面今年似乎發(fā)生了很多強(qiáng)烈的地震，根據(jù) the planet is coming apart at the seams（縫隙）．"可知整句是對(duì)前面 a signal 內(nèi)容的補(bǔ)充說明，是同位語從句，不缺成分，排除C，D，whether 是否，排除A，故選B．

點(diǎn)評(píng) 本題考查同位語從句，在熟知同位語從句連接詞，充分分析句型及句意的基礎(chǔ)上便能選出正確答案．

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