Quite a few people were injured or killed in this traffic accident last week, ________

Effective measures have been taken to prevent _______pollution.

It has been evident that too many children in the city are left ________ when their development requires parents’ close attention

Another two people were reported to have died of the Ebola virus yesterday, which caused greater _______ about their safety among the public.

依次填入下面一段文字横线处的语句,衔接最恰当的一组是(　　)数学作为文化的一部分,其最根本的特征是它表达了一种探索精神。　　　　　　,　　　　　　,　　　　　　,　　　　　　,　　　　　　。 ①人总有一个信念:宇宙是有秩序的②可是,离开了这种探索精神,数学是无法满足人的物质需要的③因此人应该去探索这种深层的内在的秩序,以此来满足人的物质需要④数学的出现是为了满足人类的物质生活需要⑤数学家更进一步相信,这个秩序是可以用数学来表达的