The order of importance in addressing dama

Don't worry if you don't understand everything, the teacher will _____ the main points at the end.[ ]

A. recover

B. review

C. require

D. remember

五年级学生达到体育锻炼标准的有100人，没有达到标准的有25人．五年级学生体育锻炼的达标率是多少？

根据句意，在答题卷标有题号的横线上，写出括号内所给单词的适当形式。

小题1:The shoes are very nice. I want to buy ___________ (they).

小题2:The new iPhone 5S must be someone ___________ (else). It isn’t hers.

小题3:Which lesson do you like ___________ (well), Chinese, English or Maths?

小题4:We can keep __________ (diary) every day. It’s interesting.

小题5:On the ___________ (one) day, he does some homework.

据大英信息网消息，2009年第一季度，大英县经济运行呈现平稳增长态势，初步核算，全县完成生产总值约为5376元，保留两个有效数字，用科学记数法表示这个数为（　　）

A．5.4×10²

B．0.54×10³

C．5.4×10³

D．0.54×10⁴

树脂硅化合物污染物常发生在哪种离子交换器？