①坚持国有经济在国民经济中的主体地位，增强控制力   
②各种所有制资本取长补短，共同发展

③国有资本放大功能与保值增值，提高竞争力   
④取消不同所有制企业的市场准入门槛，实现公平竞争

通常情况下，燃烧需要三个条件，如图所示的实验中，能证明可燃物燃烧与温度有关的是（　　）

各用一个成语替换下面语段中加横线的部分，使语言更精练。

生活就像一条千回百折的小溪，需要我们有无论经受多少挫折都决不退缩①的勇气。生活又像一位公正的法官，他不会宽恕那些蹉跎岁月的“玩看”者。如果没有脚踏实地的跋涉，一切幻想都是非常空虚不切实际的②。生活中有酸甜苦辣，也有喜悦、恼怒、悲哀、快乐③。我们要踏着青春的脚步，快快追赶，追赶属于自己的生活，做一个勇敢的不断向前奋进④的开拓者，争得青春无悔！

①  ____   ②____  ③____④____

    Job interviews can be very different from country. An interviewer's “body language” and questions, and the form of an interview are not the same around the world.

    If you're at a job interview in Japan, don't look directly into the eyes of the interviewer. It is considered impolite. But if you're at an interview in the US, you should make eye contact(交流) with the interviewer. If you don't, the interviewer may think you are not sure about your ability.

    In the US and some other countries, interviewers aren't supposed to ask questions about family and personal information. In most countries, however, personal questions are very common during job interviews.

    In Germany, your interview might begin with a very short conversation followed by a formal(正式的) interview. In Mexico and many other countries, the whole interview might not be formal.