语法填空，阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

    At first, only people ____England spoke English. Later, people from England ____ (voyage)to other parts of the world and ____that, English began to ____ (speak) in many other countrieas. Today, ____people speak English as their____, second or foreign language than ever before. Native English speakers can understand each other ____they don't speak ____same kind of English. All languages change when ____ communicate with one another. So there are British English, American English, Australian English and so on. They all have their own identity. Maybe one day Chinese English____ (become) one of the world Englishes.

    Currently offered by some famous universities, MOOCs are attractive to people who do not have the financial resources to meet the growing costs of university education, or who do not have formal qualifications. They also allow participants to study at their own pace.

    The potential for MOOCs to deliver education is obviously vast—they could be considered as a huge step forwards in widening participation. They also have the potential to provide a unique window on universities that offer popular and valuable courses, they may attract some participants to register for formal fee-paying programmes at the same or other universities and are likely to promote new ways of on-line education.

    However, it is still very early days for MOOCs. The quality of the education provision is highly variable, with many courses offering only recordings of lectures, and delivery is particularly difficult in some special fields that require practical classes, research projects or extensive library access. Besides, wider engagement with participants requires very considerable resource. Even limited feedback or examination becomes a major task if there are several thousand students in the class.

Considering the challenges, some people argue MOOCs will soon evaporate (蒸发). But they certainly provide good opportunity for widening higher education, are a means of raising awareness of universities to audiences of tens or hundreds of thousands, and are well worthy of serious consideration.

如图所示是王浩同学用相同的加热器给质量相等的甲、乙两种物质加热，根据测量结果描绘的图象，由图可知（甲、乙两种物质的比热容分别为C_甲、C_乙）（　　）