Theunderlinedword“they"inthesecondparagraphrefersto“____”.

Theunderlinedword“they"inthesecondparagraphrefersto“____”.A.environments B.holid

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铸铁管的特点是(  )。

铸铁管的特点是(  )。A.经久耐用 B.性质较脆 C.机械性能不高 D.抗腐蚀性强

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Theunderlinedword"triggered"inthethirdparagraphprobablymeans

Theunderlinedword"triggered"inthethirdparagraphprobablymeans“____”.A.setoff B.cu

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Nothingissoeasyas_____parentstoraisetheirexpectationsoftheir

Nothingissoeasyas_____parentstoraisetheirexpectationsoftheirchildrentoohigh.A.of

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