At the beginning of this century, medical scientists made an interesting discovery; we are built not just of flesh and blood but also of time. They were able to show that we all have "a body clock"  36  us, which controls the rise and fall of our body energies,  37  us different from one day to the next.

The idea of "a body clock" should not be too  38   since the lives of most living things are controlled by the 24 hour night-and-day cycle. We feel  39   and fall asleep at night and become  40  and energetic during the day. If the 24 hour-cycle is disturbed, most people experience unpleasant  41   . For example, people who are not  42   to working at night can find that  43   of sleep causes them to  44   badly at work.  45  the daily cycle of sleeping and waking, we also have other cycles which last longer than one day. Most of us would  46    that we feel good on some days and not so good on others ; sometimes our ideas seem to flow and at other times, they  47  do not exist.

A．inside        B．around                    C．between                  D．on

A．showing       B．treating                   C．making                   D．changing

A．difficult        B．exciting                  C．surprising            D．interesting

A．dull             B．tired                          C．dreamy                  D．peaceful

A．regular          B．excited                   C．lively                         D．clear

A．moments       B．feelings                  C．senses                     D．effects

A．prevented      B．allowed                  C．expected                 D．used

A．miss             B．none                    C．lack                        D．need

A．perform        B．show                   C．manage                   D．control

A．With             B．As well as            C．Except                    D．Rather than

A．agree            B．believe                   C．realize                    D．allow

A．just               B．only                       C．still                        D．yet

It was only in the eighteenth century that people  Europe began to think mountains were beautiful .___36___ that time, mountains were ___37__ by the people living on the plains,__38___ by the city people, to whom they were wild and ___39___ places in which one was easily ___40___ or killed by terrible animals.

Slowly ,however , many of the people who were living ___41__ in the towns began to grow tired of ___42___. They began to feel interested in looking for things that could not be explained , for sights and sounds which produce a feeling of fear and excitement .___43___in the __44___century, people began to turn away from the man-made __45___ to the untouched country, and particulary ___46___a place where it was dangerous and wild. High mountains began to be __47__ for a holiday.

Then , mountain-climbing began to grow popular as a sport.  To some people ,there is something greatly __48__about getting to the _49___ of a hight mountain .  Struggling against nature is finer than a battle __50____ other human beings. And then, when you are at the mountain top after a long and difficult__51__, what a _52____ reward it is to be able to look _53___on everything within__54___! At such time, you feel happier and prouder than you can ever feel down__55____.

1.                A．After          B．In             C．At   D．Before

2.                A．hated          B．liked           C．feared   D．observed

3.                A．however        B．further         C．sometimes D．especially

4.                A．exciting        B．interesting      C．dangerous D．alone

5.                A．fallen down     B．lost            C．discovered    D．caught

6.                A．unhappily       B．lonely          C．comfortable   D．easily

7.                A．them          B．it              C．themselves    D．that

8.                A．Yet            B．So             C．However  D．But

9.                A．last            B．recent          C．eighteenth    D．early

10.               A．country        B．houses         C．town D．planet

11.               A．to             B．at             C．in    D．for

12.               A．important       B．right           C．necessary  D．popular

13.               A．pleasant        B．interested      C．dangerous D．terrible

14.               A．foot           B．spot           C．top   D．tip

15.               A．with           B．to             C．against    D．between

16.               A．fight           B．climb          C．walk  D．running

17.               A．surprising       B．satisfactory      C．disappointing   D．worrying

18.               A．behind         B．up            C．down D．around

19.               A．miles          B．minutes        C．seeing D．sight

20.               A．above          B．below          C．under D．away

New genetic analysis has revealed that many Amazon tree species are likely to survive human-made climate warming in the coming century, contrary to previous findings that temperature increases would cause them to die out. A study,   1  in the latest edition of Ecology and Evolution, reveals the   2  age of some Amazonian tree species -- more than 8 million years -- and   3  shows that they have survived previous periods as warm as many of the global warming imagined periods   4  for the year 2100.

The authors write that, having survived warm periods in the past, the trees will   5  survive future warming, provided there are no other major environmental changes.   6  extreme droughts and forest fires will impact Amazonia as temperatures   7 , the trees will stand the direct impact of higher temperatures. The authors   8  that as well as reducing greenhouse gas emissions to minimize the risk of drought and fire, conservation policy should remain   9  on preventing deforestation（采伐森林）for agriculture and mining.

The study disagrees with other recent researches which predicted tree species’ extinctions   10  relatively small increases in global average air temperatures.

Study co-author Dr Simon Lewis (UCL Geography) said the   11  were good news for Amazon tree species, but warned that drought and over-exploitation of the forest remained major   12  to the Amazon’s future.

Dr Lewis said: “The past cannot be compared directly with the future. while tree species seem likely to   13  higher air temperatures than today, the Amazon forest is being transformed for agriculture and   14 , and what remains is being degraded by logging, and increasingly split up by fields and roads.

“Species will not move as freely in today’s Amazon as they did in previous warm periods, when there was no human   15 . Similarly, today’s climate change is extremely fast, making comparisons with slower changes in the past   16 .”

“With a clearer   17  of the relative risks to the Amazon forest, we   18  that direct human impacts -- such as forest clearances for agriculture or mining -- should remain a key point of conservation policy. We also need more aggressive   19  to reduce greenhouse gas emissions in order to make minimum the risk of drought and fire impacts and   20  the future of most Amazon tree species.”

1.                A．advertised      B．described       C．published D．presented

2.                A．frightening      B．surprising       C．exciting   D．interesting

3.                A．still            B．nevertheless     C．however  D．therefore

4.                A．assess          B．confirm         C．forecast  D．promise

5.                A．particularly      B．probably        C．merely   D．possibly

6.                A．Since          B．Although        C．When    D．If

7.                A．rise            B．change         C．drop D．end

8.                A．consider        B．decide         C．guarantee D．recommend

9.                A．based          B．built           C．focused  D．made

10.               A．in relation to    B．in response to   C．in reply to D．in reference to

11.               A．findings        B．thoughts        C．inventions D．writings

12.               A．threats         B．disadvantages    C．embarrassments D．instructions

13.               A．accept         B．tolerate        C．permit    D．Require

14.               A．farming        B．planting        C．catering   D．mining

15.               A．power         B．influence       C．desire D．violence

16.               A．difficult        B．clear           C．easy  D．important

17.               A．belief          B．direction       C．understanding  D．suggestion

18.               A．doubt          B．conclude       C．calculate  D．prefer

19.               A．thought        B．guidance       C．protection D．action

20.               A．secure         B．advance        C．sacrifice   D．evaluate

    At the beginning of this century,  medical scientists made an interesting discovery: we are built not just of flesh(肌肉) and blood but also of time. They were ___1___ to show that we all have a “body clock”___2___ us, which controls the ___3___ and fall of our body energies, ___4___ us different from one day to the next.

    The ___5___ of a “body dock” should not be too___6___ since the lives of most living things are controlled ___7___ the 24-hour night-and-day cycle(循环). We feel ___8___ and fall asleep at night and become ___9___ and energetic during the day. If the 24-hour cycle is ___10___ most people experience unpleasant ___11___. For example, people who are not ___12___ to working at night can find that ___13___ of sleep causes them to ___14___ badly at work.___15___ the daily cycle of sleeping and ___16___, we also have other cycles which ___17___ longer than one day. Most of us would ___18___ that we feel good on some days and not so good on ___19___; sometimes our ideas seem to flow and at other times, they ___20___ do not exist.

1．A．anxious

B．able

C．careful

D．proud

2．A．inside

B．around

C．between

D．on

3．A．movement

B．supply

C．use

D．rise

4．A．showing

B．treating

C．making

D．changing

5．A．invention

B．opinion

C．story

D．idea

6．A．difficult

B．exciting

C．surprising

D．interesting

7．A．from

B．by

C．over

D．during

8．A．dull

B．tired

C．dreamy

D．peaceful

9．A．regular

B．excited

C．lively

D．clear

10．A．disturbed

B．shortened

C．reset

D．troubled

11．A．moments

B．feelings

C．senses

D．effects

12．A．prevented

B．allowed

C．expected

D．used

13．A．miss

B．none

C．lack

D．need

14．A．perform

B．show

C．manage

D．control

15．A．With

B．As well as

C．Except

D．Rather than

16．A．working

B．moving

C．living

D．waking

17．A．repeat

B．remain

C．last

D．happen

18．A．agree

B．believe

C．realize

D．allow

19．A．other

B．the other

C．all other

D．others

20．A．just

B．only

C．still

D．yet

    The ___5___ of a “body dock” should not be too___6___ since the lives of most living things are controlled ___7___ the 24-hour night-and-day cycle(循环). We feel ___8___ and fall asleep at night and become ___9___ and energetic during the day. If the 24-hour cycle is ___10___ most people experience unpleasant ___11___. For example, people who are not ___12___ to working at night can find that ___13___ of sleep causes them to ___14___ badly at work.___15___ the daily cycle of sleeping and ___16___, we also have other cycles which ___17___ longer than one day. Most of us would ___18___ that we feel good on some days and not so good on ___19___; sometimes our ideas seem to flow and at other times, they ___20___ do not exist.

1．A．anxious

B．able

C．careful

D．proud

2．A．inside

B．around

C．between

D．on

3．A．movement

B．supply

C．use

D．rise

4．A．showing

B．treating

C．making

D．changing

5．A．invention

B．opinion

C．story

6．A．difficult

B．exciting

C．surprising

D．interesting

7．A．from

B．by

C．over

D．during

8．A．dull

B．tired

C．dreamy

D．peaceful

9．A．regular

B．excited

C．lively

D．clear

10．A．disturbed

B．shortened

C．reset

D．troubled

11．A．moments

B．feelings

C．senses

D．effects

12．A．prevented

B．allowed

C．expected

D．used

13．A．miss

B．none

C．lack

D．need

14．A．perform

B．show

C．manage

D．control

15．A．With

B．As well as

C．Except

D．Rather than

16．A．working

B．moving

C．living

D．waking

17．A．repeat

B．remain

C．last

D．happen

18．A．agree

B．believe

C．realize

D．allow

19．A．other

B．the other

C．all other

D．others

20．A．just

B．only

C．still

D．yet