根据句意, 用括号内所给单词的适当形式填空。

阅读下面四篇短文，从每题所给的A、B、C、D四个选项中选出最佳选项。

A

     “USA? Britain? Which country is better to study in?” We often hear such discussions. As China opens its door, it is a dream for many Chinese students to study abroad. They want to learn about the outside world.

      It's true that studying abroad can help students develop themselves. Their foreign language skills will be improved and it may be easier to find jobs.

     But there are problems that should be considered. Language is the first. Students must spend a lot of time learning another language.

     Students must also learn to live without parents' care and do with all kinds of things they haven't had to do before, like looking after themselves. There are reports about Chinese students abroad sinking into an ocean of difficulties and giving up finally. When they have to take care of themselves, it is hard for students to study well.

      Finally, studying abroad brings a heavy burden to the family. For most Chinese parents, the cost of studying abroad is very high. But is it worth?

     We know that there are many famous people who succeed in great things through their hard work in China. Liu Xiang is a good example. Once an American teacher invited him there, but he refused. He kept training hard with his Chinese coach. He surprised the world when he won a gold medal at the Athens Olympic Games. So when you wonder which country is better to study in, think again.

【材料一】

    先帝创业未半而中道崩殂，今天下三分，益州疲弊，此诚危急存亡之秋也。然侍卫之臣不懈于内，忠志之士忘身于外者，盖追先帝之殊遇，欲报之于陛下也。诚宜开张圣听，以光先帝遗德，恢弘志士之气，不宜妄自菲薄，引喻失义，以塞忠谏之路也。

    宫中府中，俱为一体，陟罚臧否，不宜异同。若有作奸犯科及为忠善者，宜付有司论其刑赏，以昭陛下平明之理；不宜偏私，使内外异法也。

    侍中、侍郎郭攸之、费祎、董允等，此皆良实，志虑忠纯，是以先帝简拔以遗陛下。愚以为宫中之事，事无大小，悉以咨之，然后施行，必能裨补阙漏，有所广益。

    将军向宠，性行淑均，晓畅军事，试用于昔日，先帝称之曰能，是以众议举宠为督。愚以为营中之事，悉以咨之，必能使行阵和睦，优劣得所。

    亲贤臣，远小人，此先汉所以兴隆也；亲小人，远贤臣，此后汉所以倾颓也。先帝在时，每与臣论此事，未尝不叹息痛恨于桓、灵也。侍中、尚书、长史、参军，此悉贞良死节之臣，愿陛下亲之信之，则汉室之隆，可计日而待也。

【材料二】

    飞事亲至孝，家无姬侍。吴玠^①素服飞，愿与交欢，饰名姝遗之，飞曰：“主上宵旰^②，宁大将安乐时耶！”却不受。玠大叹服。或问：“天下何时太平？”飞曰：“文臣不爱钱，武臣不惜死，天下太平矣。”师每休舍，课将士注坡^③跳壕，皆重铠以习之。卒有取民麻一缕以束刍者，立斩以徇。卒夜宿，民开门愿纳，无敢入者，军号“冻死不拆屋，饿死不掳掠”。卒有疾，亲为调药。诸将远戍，飞妻问劳其家，死事者，哭之而育其孤。有颁犒，均给军吏，秋毫无犯。善以少击众。凡有所举，尽召诸统制^④，谋定而后战，故所向克捷。猝遇敌不动。故敌为之语曰：“撼山易，撼岳家军难。”张俊^⑤尝问用兵之术，飞曰：“仁、信、智、勇、严、阙一不可。”每调军食，必蹙额曰：“东南民力竭矣！”好贤礼士，雅歌投壶，恂恂如儒生。每辞官，必曰：“将士效力，飞何功之有！”然忠愤激烈，议论不挫于人，卒以此得祸。

（选自毕沅《续资治通鉴·宋纪》）

【注释】①吴玠（1093—1139）：南宋抗金名将。字晋卿，早年从军御边，抗击西夏建功。后领兵抗金，和尚原之战中，大败金兵兀术部，破川陕路金兵进攻。因功官至四川宣抚使。②宵旰（gàn）：“宵衣旰食”的略语。天不亮就穿衣起身，天晚了才吃饭。用来称颂帝王勤于政事。③注坡：谓从斜坡上疾驰而下，与“跳壕”同为当时军事训练科目。④统制：南宋军官名，隶属于都统制。⑤张俊（1086～1154）：南宋人，曾与岳飞、韩世忠，刘光世并称南宋中兴四将，后转主和，成为谋杀岳武穆的帮凶之一，并以此博得宋高宗深宠。