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C．It is made of strong metal．
D．It is propelled by burning gas inside it．
45．A rocket is pushed up into the air when__________ A．hot gas rushes out of its head． B．it is powered by gas．
C．hot gas rushes out of its bottom． D．hot gas rushes out of its neck．
第5部分：补全短文(第46～50题，每题2分。共10分)
下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。 Houses of Future
What will houses be like in thirty years'time?No one really knows，but architects are trying topredict．________(46)．
Future houses will have to be flexible．In thirty years'time even more of us will be working fromhome．So we will have to be able to use areas of the house for work for part of the day and for livingfor the rest．Families grow and change with children arriving，growing up and leaving home． _________(47)，nothing will be as fixed as it is now．The house will always be changing to meetchanging needs．
Everyone agrees that in thirty yeasr's time we will be living in\．We will beable to talk to our kitchen machines and discuss with them what to do．Like this，\haying aparty this weekend．What food shall we cook?\．We will be able to leave most ofthe cooking to the machines，just tasting things from time to time to check．
The house of the future will be personal-each house，__________(49)，you won't haye to paintthem-you'll be able to tell the wall to change the color!And if you don't like the color the next day． You will be able to have a new one．______(50)． A．you will be able to change the color of the wall easily
B．the only thing you won't be able to do is moving the house soreewhere else C．and the machine will tell us what food we will have to buy and how t0 cook it D．what will our home be like
E．the house of the future will have to grow and change with the family F．the kids might take their bedrooms with them as thev have
第6部分：完形填空(第51～65题，每题1分，共15分)
下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Seeing Red Means Danger Ahead
The color red often means danger and by paying attention，accidents can be prevented． In
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thefuture，the color red also may help__________(51)danger at construction sites．Thanks to new workby engineers，bridge supports or_________(52)kinds of materials could one dav contain a colorswitching material．It will turn red__________(53)a structure collapses or falls apart． The secret_________(54)the color switching material is a particular type of molecule(分子)． A molecule is a group of atoms(原子)held together by chemical bonds．Molecules come (55)all shapes and sizes，and make up___________(56)．You can see，touch or feel．How a mole． cule behaves depends on___________(57)kinds of atoms it contains，and how thev're held together．
When a polymer(聚合物)containing a color switching molecule called a mechanophore(机械响应性聚合物)which is about to break，it produce a__________(58)．When a polymer withmechanophore molecules becomes\，one of the mechanophore bonds__________(60)and the material turns red．\a really simple detection method．\，one of the scientists who worked on the project． Sottos and her team tested the color switc． hing polymers in their lab．The test__________(61)proved encouraging． There is a way to get rid of the color．light．When a bright light is shone on the mechanophore．
The broken bond is fixed and the red color____________(62)．This\Problemfor engineers．They need to use the color changer in big construction projects that will be (63)in sunlight．And sunlight will make the mechanophore's warming system_________(64)． Sottos and her fellow scientists still have______________(65)work to do before．The color switc． hing molecules can be used outside the lab． 51．A．throw B．prevent C．create D．keep 52．A．other B．another C．the other D．others 53．A．until B．although C．after D．before 54．A．on B．behind C．under D．down 55．A．for B．in C．from D．at
56．A．nothing B．anyone C．someone D．everything 57．A．why B．how C．what D．where 58．A.color B．trouble C．what D．where 59．A．strong B．soff C．weak D．time 60．A．closes B．breaks C．increases D．bums 61．A．results B．rules C．tools D．methods 62．A．repairs B．controls C．finishes D．disappears 63．A．inside B．beside C．outside D．above 64．A．dangerous B．useless C．helpful D．important 65．A．a part of B．a type of C．a lot of D．a part of