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1、 step up 加紧，加强，促进 ◆I stepped up my pace to follow my classmates. 我加快脚步去追赶我的同学。 ◆The scientists have stepped up research into medicine for cancer. 科学家们已经加强了对治疗癌症的药物的研究。 step into 进入 step by step 逐步地 take steps to do sth. 采取措施做某事 follow in one's steps 步某人的后尘 The government ______ its war against terrorism after the suicide bombing in the subway. A. stepped aside B. stepped into C. stepped down D. stepped up D 句意：在地铁里发生自杀性爆炸事件之后，政府加紧了反恐斗争。 2、辨析due to, owing to, because of, thanks to 这些词组均表示“由于”之意。 (1)due to 用于较庄重的书面语中，侧重“起因于”，在句中多作表语，有时作状语。 (2)owing to 可以与due to换用，但在句中多作状语，也可作表语。 (3)because of 着重某种原因的理由，在句中通常作状语。 (4)thanks to 突出一种感激之情，含“多亏”意味。 ◆Thanks to your presence, I was able to prove my innocence. 幸亏你在场，我才能够证明自己的清白。 They didn't attend the meeting held last Friday morning ______ to the delay of the train. A. owing B. owed C. thank | 
