如图为人体消化系统局部结构，下列说法错误的是（　　）

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在下列紫荆花的结构中，将来能发育为紫荆花树上的豆荚的是（   ）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处错误。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏子符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改均仅限一词；2  只允许修改10处，多者（从第11处起）不计分。

    Cars are everywhere. In big city and small towns, the preferred method of transportation is the automobile. People can get to where they need to go quickly and easy, and it has given a new kind of freedom to many people who may not have experienced it ago. But was driving really the best thing for our society? I argue that it is not. First, pollution was a serious problem, and more cars only make them worse. There is just not way to reduce pollution without decrease the number of cars on the road. Second, cars are very dangerous. Traffic accidents are responsible tens of thousands of deaths every year. Finally, cars are so expensive for most people to afford. However, that doesn't stop low-income families from spending the most of their money to pay for the family car.

产生温室效应的气体主要是（   ）