C. Both plants and animals will change.

　　D. People need to adapt to climate change.

　　答案解析：答案为A。本题为文章主旨大意题。结合全文内容，人类活动导致全球气温升高，造成了生态系统中动植物生物钟的紊乱，最后一段 “Around the world, plants and animals are waking up to an earlier alarm clock than they used to,”再次点题。故答案为A。

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Federal regulators Wednesday approved a plan to create a nationwide emergency alert(警报) system using text messages delivered to cell phones.

　　Text messages have exploded in popularity in recent years, particularly among young people. The wireless industry’s trade association, CTIA, estimates(估计)more than 48 billion text messages are sent each month.

　　The plan comes from the Warning Alert and Response Network Act, a 2006 federal law that requires improvement to the nation’s emergency alert system. The act tasked the Federal Communications Commission(FCC) with coming up with new ways to alert the public about emergencies.

　　“The ability to deliver accurate and timely warnings and alerts through cell phones and other mobile services is an important next step in our efforts to help ensure that the American public has the information they need to take action to protect themselves and their families before, and during, disasters and other emergencies,” FCC Chairman Kevin Martin said following approval of the plan.

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