Surprising Camara WATCH out!A slingshot（弹弓） is aimed at you．But don't be afraid．It's Just a camara．It's called Slingshot Camara．The camara will catch your surprised look．Pull the rubberhand（橡皮筋）back and shoot．It takes a Picture．Two designers from South Korea made it．
Making Use of Smog SMOG（雾霾）is annoying．But what if it could be made into a diamond（钻石）？A"Smog Free Tower"will try to do that，although the diamonds will not be as real ones．Black particles（颗粒）in smog and diamonds are mostly carbon．A designer from the Netherlands made the tower．
	New Flower Home WHEN plants get too big，you have to move them from a small flowerpot to a big one．Now，the special Growth Flowerpot can save you time and energy．It's made of a special materal in origami style．It gets bigger and bigger as the plant grows．It is from Belgium．
Easy Bike Parking PARKING a bike is not easy in big cities．Here comes the bicycle﹣parking tower．You only need to use a card and push a button．Then the tower can hold your bike in an empty place inside it．You don't even need to lock the bike．
Solar Charged Light YOU can put it in your pocket．But if it's inflated（充气），it turns into a light!This is LumnAID，a solar light that can be on for 16hours after recharging（充电） with just seven hours of sunlight．Two US students designed it．

51．From the passage above，we know that　　．

A．a slingshot camara can catch one's surprised look by shooting．

B．the diamonds made from"Amog Free Tower"can be very expensive as real ones．

C．the designer of the bicycle﹣parking tower is from Belgium．

D．a LumnAID must be recharged with 16hours before using it．

52．　　might be the best gift for Mary，who loves plants but have little time on it．

A．A slingshot camara．

B．A growth flowerpot．

C．A bicycle﹣parking card．

D．A LumnAID．

53．What does the underlined word"that"in paragraph 2refer to？　　

A．Make the diamonds seem dear．

B．Make the smog become more annoying．

C．Make the diamonds from the tower．

D．Make the carbon particles in smog into diamonds．

54．Which of the following makes use of the power of nature？　　

A．Baicycle﹣prking Tower & LumnAID        

B．Smog Free Tower & Slingshot Camara

C．Baicycle﹣prking Tower & Slingshot Camara  

D．Smog Free Tower & LumnAID

55．What's the news above mainly about？　　

A．Safety．

B．Entertainment．

C．Invention．

D．Environment．