2012年5月1日，王某向甲房地产开发企业(以下简称甲企业)购买了一套80m2的住房，单价为8000元/m2，并可以使用其住房公积金。这是他购买的第一套自住普通住房，现已办理了房屋产权登记。入住后，王某发现购房合同约定的房屋面积比房屋产权登记的面积少了3m2。买卖双方对房屋面积误差的处理方式未作约定。
甲企业因房屋面积误差应当返还王某( )万元。
A．2.40
B．2.88
C．3.36
D．4.32
参考答案：B
解析：面积误差比=(产权登记面积-合同约定面积)/合同约定面积×100%=3/80×100%=-3.75%。根据误差的处理方式：产权登记面积小于合同约定面积时，面积误差比绝对值在3%(含3%)以内部分的房价款由房地产开发企业返还买受人；绝对值超过3%的房价款由房地产开发企业双倍返还买受人，即应当返还张某购房款=80×8000×3%+80×8000×(3.75%-3%)×2=28800元。
阅读下列短文，根据所读内容在文章后的表格中填入恰当的单词（注意：表格中的每个空只填一个单词） For more than twenty years scientists have been seeking to understand the mystery of the ‘‘sixth sense" of direction．By trying out ideas and solving problems one by one，they are now getting closer to one answer． One funny idea is that animals might have a built-in compass(指南针)． Our earth itself is a big magnet(磁体)．So a little magnetic needle that swings freely lines itself with the big earth magnet to point north When people discovered that idea about a thousand years ago and invented the compass，it allowed sailors to navigate (航海)on ocean voyages, even under cloudy skies.  Actually the idea of the living compass came just from observing animals in nature． Many birds migrate twice a year between their summer homes and winter homes．Some of them fly for thousands of kilometers and mostly at night．Experiments have shown that some birds can recognize star patterns．But they can keep on course even under cloudy skies．How can they do that? A common bird that does not migrate but is great at finding its way home is the homing pigeon．Not all pigeons can find their way home．Those that can are very good at it，and they have been widely studied． One interesting experiment was to attach little magnets to the birds’ heads to block their magnetic sense—just as a loud radio can keep you from hearing a call to dinner．On sunny days, that did not fool the pigeons．Evidently they can use the sun to tell which way they are going．But on cloudy days，the pigeons with magnets could not find their way．It was as if the magnets had blocked their magnetic sense． Similar experiments with the same kind of results were done with honeybees．These insects also seem to have a special sense of direction． In spite of the experiments，the idea of an animal compass seemed pretty extraordinary．How would an animal get the magnetic stuff for a compass. An answer came from an unexpected source．A scientist was studying bacteria that live in the mud of ponds and marshes．He found accidentally little rod-like bacteria that all swam together inone direction—north． Further study showed that each little bacterium had a chain of dense particles inside，which proved magnetic．The bacteria had made themselves into little magnets that could line up with the earth’s magnet． The big news was that a living thing，even a simple bacterium，can make magnetite．That led to a search to see whether animals might have it.. By using a special instrument called magnetometer，scientists were able to find magnetite in bees and birds，and even in fish．In each animal，except for the bee．the magnetic stuff was always in or closer to the brain．Thus．the idea of a built—in animal compass began to seem reasonable．
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