Africa has been called the “dark continent” for a long time because ____ lacks technology, electricity and other ____ (achieve) of the modem world. However, it is beginning to change. Africa is starting to catch up with ____ (industry) countries and the driving force behind this new development is the Internet and the World Wide Web.

    Now Africa is the fastest ____ (grow) place on the earth. So far, governments, businesses and individuals ____ (realize) that in order to develop quickly, modem technology is needed.

    Only ten years ago a SIM card used to cost about $100 in Niger. Today you can buy one for under $2 and phone calls have become much ____ (cheap), too. As a result, 23% of its population are now mobile phone users.____ (equip) with this new service, people can connect to the Internet easily. Many Nigerians have access ____ the World Wide Web now.

    In Ethiopia farmers can now get the prices of their farming products in real time. Until recently, most of the small farmers of the country did not know ____ the prices of their products were at ____ certain time. Today, they can phone in and get an up-to-the-minute report on prices.

P、Q是同一直线上相距12米的两点，甲、乙两物体分别从P点与Q点同时出发，它们的s﹣t图象如图所示，经过2秒钟，则（      ）

句型转换。

从课文《幽径悲剧》得到什么启发。

作者这样写是借助古藤的哭泣来描摹自己痛苦、悲愤的内心感受，非常逼真，含泪带哭的诉说更增添了一种震憾人心的力量。