动物的运动，有利于动物个体的____ 和种族的____ ，从而提高了对环境的适应能力。人的运动需要消耗能量，能量来自于肌细胞内____ （有机物或无机物）的氧化分解。

①企业经营状况   
②银行利率

③股民心理   
④投资风险

下列各组铁路线中，属于东西走向的是（　　）

比一比“ui  iü”

u哥排第一i弟在身后，____脱帽带声调，回回回；i弟排第一位u哥在身后，____举旗标声调，游游游。

    Keeping a diary in English is one of the best ways to improve our English writing ability.

    Compared with other forms of writing, it is shorter and takes ____(little) time. It can help us to develop the habit of thinking in English.____we stick to this practice,____ (gradual) we'll learn how to express (表达) ourselves in English. In keeping a diary in English, we certainly run up against many ____ (difficult). In the first place, it often ____(happen) that we have trouble ____(find) proper words and phrases to give expression to our mind. And____ is very hard for us to put them into English properly.

    As far as I am____(concern), my suggestion is that we should always have a notebook and a Chinese­English dictionary within easy reach. We can also turn to our English teacher for help, if necessary. In short, I believe that it is ____great use to keep a diary in English for the development of ____ (we) writing skills.