C．She got little support from her parents.

　　D．She has called on people to donate hair like her.

　　解析：　细节理解题。根据倒数第二段的 Smith posted his daughter's moving gesture on his personal webpage，where it has received almost 645,000 views in just two days可知，Ariana帮助他人的举措在网络上受到广泛关注。

　　答案：　B

　　B

　　Even in challenging economic times，making sure that study abroad is part of our college students' education is an important investment (投资)．If we want a new generation of leaders who can be productive in an ever more globalized world，sending our students overseas is not a luxury (奢侈)．It's a necessity.

　　Learning in a different culture and place allows us to see our own challenges as we observe smart people in other lands dealing with similar problems.

　　American college students understand the value of study abroad.Four out of every five first­year students expect to study overseas.But at any given time，only about 2% of students are able to.Educators are especially concerned that the lack of chance for students from poor socioeconomic backgrounds will cause a "global divide" between students who've benefited from a global education and those who haven't.And students for whom foreign travel is not easily affordable are the ones who benefit most from the experience.As a society，we can help improve the education of our younger generation，and brighten their futures，by making this experience more available.

　　Is now the time to use valuable public money to send college kids overseas？Of course.Our world is one big，rapidly developing marketplace.Employers long for graduates who are multilingual (使用多种语言的) and comfortable in multicultural settings.Study abroad sharpens these skills and helps keep American workers competitive.

　　Americans who want our next generation to be hands­on with the world-working with international partners against challenges，working competitively in a globalized economy，and having enthusiasm rather than anxiety about other cultures and approaches to existing problems-can get on board with the movement to help our students get a globalized education.Encourage the young people in your lives to get a passport and see the world as a classroom.It's good for America.And it's fun.

　　语篇解读　本文是议论文。作者阐述了对出国留学的观点：出国留学是必要的，而不是一种奢侈。

　　4．What is the author's attitude towards study abroad?

A．Negative. B．Doubtful.