A．She stopped working and studied further.

　　B．She made friends with many famous singers.

　　C．She set about performing in different occasions.

　　D．She actively set out to create new songs every day.

　　解析：选D　细节理解题。根据第二段中的"To do with the stress, Jepsen threw herself into creating new songs every single day."可知，为了应对压力，卡莉·蕾·吉普森每天创作新歌曲。故选D项。

　　2．Which of the songs is as popular as Call Me Maybe?

　　A．Run Away With Me.　　　 　B．Boy Problems.

　　C．I Really Like You. D．All That.

　　解析：选C　细节理解题。根据第七段中的"Yes, it's true that I Really Like You is a kind of 2015 version of Call Me Maybe."可知，歌曲I Really Like You 就是2015版的Call Me Maybe。再根据文章第一段的第一句可知，选C项。

　　3．According to the text, Jepsen is likely to be ________.

　　A．learned and good at changing

　　B．brave and popular with the young

　　C．humorous and willing to help others

　　D．productive and willing to try new things

　　解析：选D　推理判断题。根据第七段中的"Jepsen gets adventurous, experimenting with deeper material"和第八段中的"Jepsen reveals a few musical styles that we've never heard from her before."可知，卡莉·蕾·吉普森勇于尝试新事物；根据第三段中的"Over the next three years, the singer wrote over 200 songs"可知，她是一位多产的歌手。故选D项。

　　4．What can we infer from the text?

　　A．Everyone likes I Really Like You.

　　B．The song Emotion is very energetic.

　　C．Jepsen wins lasting appeal by her songs.

　　D．Jepsen became a singer at the age of 25.

　　解析：选C　推理判断题。根据第六段中的"The appealing, energetic ..."可推知，卡莉·蕾·吉普森通过自己的歌曲而获得了持久的吸引力。故选C项。

　　B

　　Biologists have been making noise in the forests of the western American state of Idaho. They are making noise to study the value of quiet in nature. They want to know how people and animals react to noise pollution.

The researchers placed outdoor speakers on the side of a half­kilometer­long part of a road in the Boise National Forest. For two years, they played the sounds of passing cars