稻纵卷叶螟是一种（）。原是局部发生，间歇为害，现已成为常发性害虫。

在共产主义社会，劳动将成为人们生活的第一需要，这表明劳动（）

A:已成为可有可元的事情 B:已成为纯粹的娱乐和消遣 C:已不是每个社会成员应尽的义务 D:已成为一种高度自觉、自由、自主的活动

在现代社会，“策划”已成为一种具有方法论意义的（）方式和运作方式。

把档案纳入更广泛的国家文化和文献遗产的立法体系，已成为一种趋势，在一些国家已成现实，如巴西、美国、荷兰等。

（）动力夹紧装置已成为一种通用夹具及机床附件。

在造球过程中向润湿不足的物料内（）已成为目前最广泛的一种方法。

哪一种台球项目最为普遍、而且被官方认可，已成为一项比赛项目？

______旅游业已成为世界经济的支柱产业，______已同其他消费品一样成为一种______。

　写作要求:出国留学已成为一种潮流,请你就此问题谈一谈自己的观点,简要论述留学的利与弊。词数为100左右。　写作要求:出国留学已成为一种潮流,请你就此问题谈一谈自己的观点,简要论述留学的利与弊。词数为100左右。

　　范文如下:

　　Nowadays going abroad to study is very popular. Even some primary school students, whose families are well off, are studying abroad, let alone university students and postgraduates. Studying abroad can widen one's view and help learn about the cultures of foreign countries. Of course, it's a good way to learn foreign languages. But studying abroad is not suitable for everyone because of the high cost and fees. If a student's family can't support him and he has to struggle in a foreign country for a living not for his studies, I think he needn't go abroad. He can study well in China and he will be able to become successful.

　　So going abroad to study is one way, but not the only way, to one's education and success.