题目内容
10．Just now the patient opened her mouth as if ______something to her husband．（ ）| A． | said | B． | say | C． | to say | D． | to have said |
分析 刚才这个病人张开嘴好像要对她丈夫说点什么．
解答 答案：C．
当as if从句的主语和主句一致时，该主语和后面的动词都可省略，即构成了as if+to do的用法，结合句意"好像要对她丈夫说点什么"可知，是要说还没说，所以用不定式；故选C．
点评 as if后面多跟虚拟语气的句子，如：谈论现在情形的，用过去时（动词be用were，也可用was）：
Why is she looking at me as though she knew me？他为什么那样看我？像是认识我似的．
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1．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 and south．When people discovered that idea about athousand years ago and invented the compass，it allowed sailors to navigate （航海）on oceanvoyages，even under cloudy skies．
Actuallly 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 ot 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 in one 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．
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 and south．When people discovered that idea about athousand years ago and invented the compass，it allowed sailors to navigate （航海）on oceanvoyages，even under cloudy skies．
Actuallly 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 ot 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 in one 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．
| The Magnetic Sense-The Living Compass | |
| Passage outline | Supporting details |
| The existence of the earth magnet and the invention of the navigating compass | ◇Our earth is a big magnet and a little freely （71）swinging magnetic needle lines itself with the earth magnet to point north and south． ◇（72）Basedon the idea above，the navigating compass was invented． |
| The possibility of birds'built-in compasses | ◇One piece of evidence is the （73）migrationof many birds between their summer homes and winter homes． ◇Birds can recognize star patterns on clear nights and keep on course （74）even under cloudy skies |
| The （75）experiments/tests/study/research on pigeons'and bees'built-in compasses | ◇Little magnets were tied to the pigeons'heads to （76）block their magnetic sense． ◇The pigeons'magnetic sense seemed to be affected on （77）cloudydays． ◇Similar things with the same results were done with bees． |
| The （78）discovery of the magnetic stuff for the animal compass | ◇Little rod-like bacteria were found by chance to swim together in the direction of （79）north． ◇Some animals had a chain of dense magnetic particles in or close to the （80）brain（s） inside their bodies． |
18．The person who takes no chances generally has to take is left when others are through choosing．（ ）
| A． | however | B． | whatever | C． | whenever | D． | whoever |
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-Well．He _____ have gone far-his glasses are still here．（ ）
-Well．He _____ have gone far-his glasses are still here．（ ）
| A． | shouldn't | B． | mustn't | C． | can't | D． | wouldn't |
15． the employees'working efficiency，the manager will allow them to have a coffee break．（ ）
| A． | Improving | B． | To improve | C． | Improved | D． | Having improved |
2．-Do you want to play table-tennis，Tom？
-________．I feel like doing something different．（ ）
-________．I feel like doing something different．（ ）
| A． | Don't mention it | B． | I don't want it | ||
| C． | I don't think so | D． | Not really |
19．_____ means that you have a positive attitude toward your abilities and life．（ ）
| A． | Be confident | B． | Being outgoing | C． | To be outgoing | D． | Being confident |
8．If you smile，_____you're in a bad mood，it will immediately improve your mood．（ ）
| A． | when | B． | only if | C． | even if | D． | once |