如果一个长方体的四个面的面积相等，则其余两个面一定是（     ）。

秋宿湘江遇雨

唐·谭用之

湘上阴云锁梦魂，江边深夜舞刘琨^②。秋风万里芙蓉国^②，暮雨千家薜荔村。

乡思不堪悲橘柚，旅游^②谁肯重王孙^④。渔人相见不相问，长笛一声归岛门。

【注】①刘琨：晋代人，当时北方被少数民族所统治，刘琨和好友祖逖胸怀统一大志，他们常常闻鸡鸣而起舞，准备为国家做一番事业。②芙蓉国：湖南因广生木芙蓉，故有芙蓉国之称。③旅游：指长期旅居他乡。④王孙：这里指游子。

读下图及文字资料，回答题。
材料一：山东半岛的烟台、威海地区每年冬季都有大雪降临。特别是2005年12月份以来，我国遭到持续冷空气的袭击。在威海和烟台，短短20多天下了三场强降雪，出现了50年来罕见的雪情。
材料二：近年来，山东已成为我国北方地区重要的蔬菜生产基地之一。

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    In recent years,sandstorms ____(occur) in China frequently,especially in northwestern areas, ____severe influence has caused wide concern in China.

There're several reasons for this.First of all,people are cutting down trees without planting more, ____(make) some land become deserts.Another reason is ____it rains less due to the environment pollution.

    To ____(efficient) prevent sandstorms,first,we should plant more trees and grass which can keep the soil ____ being washed away.Second,more green fences should ____(build) along the desert, ____it helps to control the process of the desertification.

    Let's take action to do what we can ____(prevent) sandstorms from today.Soon the golden days we have been looking forward to ____(come).