C．We should regard them as ordinary people.

　　D．We should show sincere respect to them.

　　解析：C　细节理解题。根据第四段的Instead of getting caught up...be comforting to just recognize that we are all humans可知，没必要纠结于那么多为什么，以一颗平常心看待周遭，大家都是普通人，都有相似的情感诉求，都会被周围环境感染，所以顺其自然尽快融入大环境才是上上策。

　　4. Which is a bad idea when studying abroad?

　　A．Learning the new culture from locals.

　　B．Learning and feeling like a global citizen.

　　C．Just keeping away from your own culture.

　　D．Not totally involving yourself in the new culture.

　　解析：D　细节理解题。根据最后一段but why would you choose to study abroad and then not fully immerse yourself in the culture可知，作者对这种不能完全融入当地文化的行为表示不赞赏。

　　B

　　　　 Brain cancer now leads to more deaths of children than any other kind of childhood cancer in the United States. It now causes more deaths of children than leukemia(白血病) as treatment advances have allowed doctors to cure many blood­related cancers, the Centers for Disease Control and Prevention said on September 15,2016.

　　 In 1999, nearly one in three children who died of cancer had leukemia, while brain cancer caused the deaths of one in four. By 2014, the numbers had been exchanged. "Forms of leukemia that a generation ago were almost universally deadly now mostly can be cured，" said Sally Curtin, an author of the report, in a telephone interview.

Overall, cancer death rates for children dropped 20 percent from 1999, continuing a trend that started in the mid 1970s, according to the National Center for