通商口岸贸易情形记载，“自近年设立洋船税关，生意顿盛。洋纱一纵，尤为畅销。业此者现有四十五家，而每日所获，各不下三四百金。惟本地所产之棉花，其价日贱，且无人问津。”这种现象出现造成了（    ）

    呀      啊     呢     哪    吧

①叶子上生了蚜虫，快治一治____！

②大海无边无际，大得很____！

③小明，你从哪儿来____？

④快长____！长得赛过大南瓜才好____！

在“探究弹性势能的表达式”的活动中为计算弹簧弹力所做功，把拉伸弹簧的过程分为很多小段，拉力在每小段可以认为是恒力，用各小段做功的代数和代表弹力在整个过程所做的功，物理学中把这种研究方法叫做“微元法”。下面实例中应用到这一思想方法的是（    ）

    There are many kinds of pollution around us,1 air pollution, soil pollution, noise pollution and light pollution. They are bad 2our health in many ways.

    Burning gas, oil and coal creates air pollution. It can cause sore eyes and 3 problems.

    With the increase of pollution and the 4 of industry, litter is everywhere. It makes our environment dirty. People put lots of rubbish in the land. Farmers use too many chemicals in the fields. They destroy the soil. So soil pollution has become serious.

    Noise pollution can make people 5 For example, people may lose their hearing if they work in a 6 place for a long time. Too much noise can cause high blood pressure 7

    Working for a long time in strong, changeable light 8 cause some kind of illnesses. It makes people feel 9 and is especially bad for the eyes.

With 10 pollution, our planet will become greener and our health will be better. Let's be greener people.