表面活性剂是加入(____)量就能显著(____)溶液(或溶剂)表面张力的物质。

Many boys enjoy _______ football, basketball or baseball

Which do you think is ________, health or wealth？

_______________will not continue if an ongoing operation is changed or deletedA、

CSF中IgG、IgA及IgM的检测对某些神经系统疾病的诊断或鉴别诊断有意义，如结核性脑膜炎，______________增高显著；化脓性脑膜炎，____________________显著增高；病毒性脑膜炎时IgA及IgM_____________。

29．__________ when you are on the bus or bike．

学校教育心理学的主要研究方法有__________、__________、教育经验总结法、自然实验法、实验室实验法和__________。

Which do you think is _________________important, health or wealth?

And they can ______their passports______，making leaving or “escaping” virtually impossible.

学校教育心理学的主要研究方法有__________、__________、教育经验总结法、自然实验法、实验室实验法和__________。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

在研磨过程中,被加工表面发生复杂的物理和化学作用,其主要作用有如下三个方面:_______、_______、______。