C　解析：细节理解题。根据第一段中的"who slipped in the snow and broke his neck"及第三段中的"After the accident, he was unable to move in the snow."可知，Bob在雪地中滑倒伤到了脖子，不能动了。故选C项。

　　2．Why did Kelsey keep barking?

　　A．To keep warm.

　　B．To stay alive.

　　C．To keep Bob awake.

　　D．To seek help from others.

　　D　解析：推理判断题。根据第四段中的"By the next morning, my voice was gone and I couldn't yell for help, but Kelsey didn't stop barking."可推知，Kelsey一直叫的目的是找人来帮助主人，故选D项。

　　3．How does Dr. Chaim Colen feel about Kelsey?

　　A．Helpful. B．Fortunate.

　　C．Grateful. D．Friendly.

　　A　解析：推理判断题。根据倒数第二段中的"Dr. Chaim Colen, the doctor who treated Bob, said, 'Animals can help and his dog really saved him...He was very fortunate.'"可知，Chaim Colen医生认为动物能提供帮助，Bob的狗救了Bob，因此Chaim Colen医生认为Kelsey是有帮助的，故选A项。

　　4．What can be a suitable title for the text?

　　A．A Neck－Breaking Accident

　　B．The Magic Night

　　C．Warmth on a Winter's Night

　　D．Determination to Keep Alive

　　C　解析：标题归纳题。通读全文内容并根据倒数第二段中的"However, doctors were surprised to find that he didn't have any frostbite(冻疮). They believed it was because of Kelsey's determination to keep him warm."可知，Bob在寒冷的夜里衣着单薄却没有任何冻疮是因为他的狗用身体不停地温暖他，故C项"冬夜里的温暖"作文章标题最合适。

　　B

(2019·北京卷)By the end of the century, if not sooner, the world's oceans will be bluer and greener thanks to a warming climate, according to a new study.