. The biggest problem for most plants, which ___ just get up and run away when threatened, is that animals like to eat them.
A．shan’tB．can’t
C．needn’tD．mustn’t
B。
can在此表示能力，can’t表示“不能”。此題所考查的知識(shí)點(diǎn)比較簡單，但由于句子結(jié)構(gòu)比較復(fù)雜，所以許多學(xué)生不是由于沒有弄清知識(shí)點(diǎn)而誤選，而是由于不理解句意而誤選。全句意為：對(duì)于大多數(shù)植物來說，它們所面臨的最大問題是(有些)動(dòng)物喜歡以它們?yōu)槭澄铮?dāng)它們受到威脅時(shí)卻不能起身逃跑。
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