2010年4月30日晚，以“城市，让生活更美好”为主题的世界博览会在上海开幕，这是我国继北京奥运会后举办的又一重大国际盛事，也是世博会历史上第一次落户发展中国家。在世博会期间，有2000余名上海青少年志愿者为大家服务，青少年争当志愿者
①表明个人索取是不正当的行为
②有利于青少年成长、成才
③必将获得正确的经验和科学的认识
④有利于青少年在对社会、对他人的奉献中实现人生价值

口算．

5.6＋2.8=____          8.1－2.7=____             1.5×0.6=____ 

4.08÷0.8=____        1.75＋3.8＋0.25=____      3.8＋4.6＋5.4=____  

2.5×12=____         1.25×16=____             3.5＋2.5×3=____      

5.4－4.8÷1.2=____

负责英国对印度等亚洲国家殖民侵略的机构是(    )

已知$a=100\times 99\times 98\times 97\times 96\times 95$，则$a=$（    ）.

阅读理解
    Recently, an Internet game has become a new fashion among young office workers and students. People can “farm” on a piece of “land” and “grow”, “sell” or even “steal” “vegetables”, “flowers” and “fruits” on the Net. They can earn(挣) some e-money and buy more “seed”(种子), “pets” and even “houses”.
    Li You from Xi'an said people in the city get tired from work, they go to their own farms, take care of their crops(庄稼), and pull out weeds(杂草). It is glad to forget about the pressure in cities.
    Li Bu grew up in a small village, and then he went to a city, but now he misses the life in the village and “Happy Farms” makes the country dream possible in his office. He said every time he sees his crops, dogs, and grasses, he feels like he is in the village again. When he is working on his farm, he can feel the breath of nature, and get happiness from farming and harvesting(收获).
    Li Lei enjoys putting some “bugs”(虫) in my friends' garden and they've become closer because of the game. Having fun together is the most exciting thing about it.
    Li Hong said it was just a waste of time. Teenagers spend so many hours on it and they can't focus on their study.