13．______ the project in time，the staff were working at weekends．（　�。�
A．CompletingB．Having completed
C．To completeD．To have completed

分析 為了及時(shí)完成項(xiàng)目，全體員工在周末也加班．

解答 答案：C．
根據(jù)后面的句子the staff were working at weekends可知，員工加班是為了及時(shí)完成任務(wù)，前面為不定式表示目的；故選C．

點(diǎn)評(píng) 本句考查不定式作目的狀語，相當(dāng)于in order to，前后的邏輯關(guān)系是判斷非謂語動(dòng)詞的一個(gè)依據(jù)．

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：選擇題

19．I went to the party with my good friend Rose，         a happy evening of wine，food and
song．（　�。�
A．expectingB．to expectC．expectedD．having expected

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

20．"Genius"is a complicated concept，       many different factors．（　�。�
A．involvedB．involvingC．toinvolveD．beinginvolved

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

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（指南針）．
Our earth itself is a big magnet（磁體）．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 outlineSupporting 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．

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

8．The 2012 London Olympics had enough problems to worry about．But one more has just been added-a communications blackout caused by solar storms．
     After a period of calm within the Sun，scientists have detected the signs of a flesh cycle of sunspots that could peak in 2012，just in time for the arrival of the Olympic torch in London．
     Now scientists believe that this peak could result in vast solar explosions that could throw billions of tons of charged matter towards the Earth，causing strong solar storms that could jam the telecommunications satellites and interact links sending five Olympic broadcast from London．
"The Sun's activity has a strong influence on the Earth．The Olympics could be in the middle of the next solar maximum which could affect the functions of communications satellites，"said Professor Richard Harrison，head of space physics at the Rutherford Appleton Laboratory in Oxfordshire．
     At the peak of the cycle，violent outbursts called coronal mass ejections （日冕物質(zhì)拋射） occur in the Sun's atmosphere，throwing out great quantities of electrically-charged matter．"A coronal mass ejection can carry a billion tons of solar material into space at over a million    kilometres per hour．Such events can expose astronauts to a deadly amount，can disable satellites，cause power failures on Earth and disturb communications，"Professor Harrison added．The risk is greatest during a solar maximum when there is the greatest number of sunspots．
     Next week in America，NASA is scheduled to launch a satellite for monitoring solar activity called the Solar Dynamics Observatory （SDO），which will take images of the Sun that are 10 times clearer than the most advanced televisions available．
     The Rutherford Appleton Laboratory helped to make the high-tech cameras that will capture images of the solar flares （太陽耀斑） and explosions as they occur．
     Professor Richard Hold away，the lab's director，said that the SDO should be able to provide early warning of a solar flare or explosion big enough to affect satellite communications on Earth"If we have advance warning，we'll be able to reduce the damage．What you don't want is things switching off for a week with no idea of what's caused the problem，"he said．

72．The phrase"communications blackout"in paragraph 1 most probably refers toB during the 2012 Olympics．
    A．the extinguishing of the Olympic torch
    B．the collapse of broadcasting systems
    C．the transportation breakdown in London
    D．the destruction of weather satellites
73．What can be inferred about the solar activity described in the passage？D
     A．The most fatal matter from the corona falls onto Earth．
     B．The solar storm peak occurs in the middle of each cycle．
     C．It takes several seconds for the charged matter to reach Earth．
     D．The number of sunspots declines after coronal mass ejections．
74．According to the passage，NASA will launch a satellite toC
    A．take images of the solar system    B．provide early warning of thunderstorms
    C．keep track of solar activities     D．improve the communications on Earth
75．Which of the following might be the best title of the passage？D
   A．Solar Storms：An Invisible Killer
   B．Solar Storms：Earth Environment in Danger
   C．Solar Storms：Threatening the Human Race
   D．Solar Storms：Human Activities to Be Troubled．

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

18．The person who takes no chances generally has to take     is left when others are through choosing．（　　）
A．howeverB．whateverC．wheneverD．whoever

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

5．-Do you know where David is？I couldn't find him anywhere．
-Well．He _____ have gone far-his glasses are still here．（　�。�
A．shouldn'tB．mustn'tC．can'tD．wouldn't

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

2．-Do you want to play table-tennis，Tom？
-________．I feel like doing something different．（　�。�
A．Don't mention itB．I don't want it
C．I don't think soD．Not really

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

11．The law says that all public buildings must be accessible to people who have trouble _____．（　�。�
A．walkingB．walkC．to walkD．walked

查看答案和解析>>

同步練習(xí)冊(cè)答案