阅读下列短文，从每小题所给的A、B、C、D四个选项中选出最佳选项。

　　Mr．and Mrs．Green were very worried about their son, Leo．He seemed to be dumb(哑的)　　1　　 he was normal in every other way．Mr．and Mrs．Green tried everything to get him to 　　2　　, but with no success．

　　When Leo was six years old, the best doctors in the town 　　3　　 him carefully, but could find nothing wrong．And he seemed to be smart．It was just that he 　　4　　 spoke．

　　"There might be something wrong with his 　　5　　, and he doesn't know he's able to speak, " one doctor said．

　　"But he can read and write, " said Mr．Green．"We've written him notes, telling him that he can speak．"

　　"It's certainly very 　　6　　, " another doctor said．"Perhaps he'll be able to speak some day．"

　　　　7　　 passed．Leo went to university．But he did not speak a 　　8　　 word．

　　Then one day, Leo was having a meal with his parents．Without any warning, he looked up from his 　　9　　 and said, "Pass me the salt, please．"

　　Mr．and Mrs．Green were excited．"You spoke! You spoke! " they cried, "Why have you 　　10　　 so long to speak? "

　　"I didn't have anything to say, " he said．"Until now everything was perfect．But you forgot to put salt in these potatoes．"

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阅读理解

　　Did you see snow in your hometown last winter?Did you feel it was warmer than before?

　　"There have been 21 warm winters in China since 1986," said scientists．They also said that in the past 100 years, as the global(全球的)temperatures went up by 0.74℃, the temperature in North China has climbed 1.4℃ in only 50 years．

　　China needs to take quick action to cut carbon dioxide(二氧化碳)emission(排放), because it's the main reason for global warming．The good news is that China has seen the importance of going green．China set the goal of cutting energy use by 20 and pollution emission by 10 in the 11th Five-Year Plan．

　　Can you slow global warming?Sure!You and your family can take steps to cut the amount of carbon dioxide that is sent out into the air．

　　Here are some pieces of advice to help you save the earth．

　　Wear used clothes．Wearing your brother's, sister's or dad's old T-shirt means you save the energy．

　　Change your light bulbs(灯泡)．Use energy-saving light bulbs．And don't forget to turn off the lights when you leave a room and turn off your television and computer when they are not in use!

　　Ride the bus．Taking a bus saves a lot of oil every year．

　　Say no to plastic bags．The next time your parents go to the market, ask them to use baskets

　　Open a window．Don't use the air conditioner(空调), and let some fresh air in．When you have to use the conditioner, set the temperature higher in the summer and lower in the winter to save energy

　　Make small changes in your daily life．Don't use paper cups, bags and boxes．

　　It's time for all of us to do something to save the earth．

根据短文内容，选择正确答案

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