答案：A　细节理解题。根据第四段最后一句“There is a recent report on warmer temperatures' negative effects on plankton, the base of the marine ecosystem.”可知，气候变化已经对浮游生物产生了有害影响。故A项正确。

　　5．What's the author's attitude toward climate change in the passage?

　　A．Concerned.

　　B．Optimistic.

　　C．Indifferent.

　　D．Confident.

　　答案：A　观点态度题。根据文章最后一句“So, it is likely that more negative influences of climate change will be shown in future.”可知，作者对气候变暖对生物的影响有些担忧。故A项Concerned(关心的)符合语境。

　　B

　　The idea of changing the world seems very crazy, but there are a number of small everyday things we can do to make the world better. Community centers, parks, libraries, homeless shelters, hospitals and schools are all places where students can make a difference through service.

　　Alisia Orosco, 10, wanted to show her love and care to the sick kids at University Children's Hospital in Texas, where her brother had been a patient. She earned money by doing part­time jobs and used it to buy different toys for the children in hospital. Now she visits three hospitals every year with bags of toys. “I hope to help as many kids as I can，” Alisia says. “It makes me happy to make them smile.”

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