题目

将金属镍（Ni）、锰（Mn）分别放入其他三种金属X、Y、Z的盐溶液中，反应中有无金属析出的情况如下表所示。 X盐溶液Y盐溶液Z盐溶液 Ni无无有 Mn无有有 它们的金属活动性由强到弱的顺序为A．X Mn  Y  Ni Z                 B．Z  Ni   Y   Mn  XC．Z  Mn Y   Ni X                D．X  Mn  Ni  Y   Z People live in different houses. You may know a wooden house or a paper house. But do you know a(n)    1   house?In 2008, the first ice house in North America opens its    2   to welcome some visitors. The floors, windows and walls are all made of ice. It has ten bedrooms    3   twenty people can stay there each night. Visitors to the house    4   in ice beds, sit on ice chairs and eat from ice plates. Well, the toilets are not made of ice, of course. It’s usually below zero so it is very    5   inside the house. However, do the visitors just sit there to    6   warm? No, visitors have to    7   special clothes. These can make    8  feel warm until morning.Workers    9   about four weeks designing the ice house. Visitors can only stay in this ice house in winter. It isn’t    10   in hot summer. Because this house is so special, it is becoming popular with young people.小题1:A．toyB．waterC．iceD．candle小题2:A．windowB．door C．shop D．book小题3:A．butB．becauseC．ifD．and小题4:A．cookB．lieC．standD．change小题5:A．coldB．hotC．brightD．dark小题6:A．say B．shineC．keepD．call小题7:A．makeB．wear C．dressD．hope小题8:A．themB．youC．itD．us小题9:A．needB．costC．payD．spend小题10:A．earlyB．cleanC．closedD．open