4．NASA sent GROVER to Greenland in order to ________.

　　A．explore the resources in Greenland

　　B．do experiments with some college students

　　C．set up an engineering summer camp in Greenland

　　D．study how and why Greenland's ice sheet is changing

　　解析：选D　细节理解题。由第二段的"scientists need to learn more about how and why Greenland's ice sheet is changing"以及第三段的"NASA sent GROVER to Greenland to begin gathering data on the changes that the ice sheet is undergoing"可知。

　　5．The fourth paragraph is mainly about ________.

　　A．the current environment in Greenland

　　B．the reasons for Greenland's melting ice

　　C．the consequences of Greenland's melting ice

　　D．the experiences NASA scientists have had in Greenland

　　解析：选C　段落大意题。第四段主要讲述科学家预言冰川融化可能会给格陵兰岛带来的影响--海平面上升、洪涝灾害严重、小的岛屿将会消失。

　　6．According to the text, GROVER ________.

　　A．is powered by batteries

　　B．can be used as an aircraft

　　C．was designed by NASA scientists

　　D．can work at any time during the day

　　解析：选D　细节理解题。由倒数第三段的"... powered by solar energy. It will be able to run anytime throughout the day or night ..."可知，由于夏日的北极圈会有极昼，因此依靠太阳能获取动力源的GROVER可以全天候随时工作。

　　7．Lora Koenig's attitude towards GROVER might be ________.

　　A．hopeful B．worried

　　C．uncertain D．dissatisfied

　　解析：选A　观点态度题。由倒数第二段Lora Koenig说的"Robots like GROVER will give us a new tool for glaciology studies"可知，他对机器人GROVER抱有希望。

　　C

　　Climate change has been blamed for killer hurricanes, sea level rise, and drought, but a new report suggests the effects of climate change might hit the world's coffee supply. Up to 70 percent of the world's coffee supply could be threatened over the next 66 years, according to a new study by researchers at England's Royal Botanic Garden.

Nearly 100 percent of the world's arabica coffee growing regions