高二英语一课一练

　　（ ）18. We＇ll have to finish the job.＿＿＿＿＿.

　　A. long it takes however     B. it takes however long

　　C. long however it takes       D. however long it takes

　　（ ）19.______she couldn’t understand was _______ fewer and fewer students showed interest in her lesson.

　　A. What , why  B. That , what   C. What , because   D. Why , that

　　（ ）20. Someone is ringing the doorbell. Go and see ___________.    A. who is he  B. who he is     C. who is it       D. who it  is

　　三、完形填空

　　Throughout history man has accepted the fact that all living things must die，but people now live longer than they used to. Yet，all    1    things still show the effect of aging，which will eventually（最终）   2   death，the body and the    3    they form do not function as well as they   4   in childhood and adolescence（青春期）.The body provides less     5   against disease and is more prone（易于……的）    6    accident.

　　A number of related causes may    7    to aging. Some cells of the body have a    8     long life，but they are not    9    when they die. As a person ages，  10    of brain cells and muscle cells decreases. Other body cells died and are replaced by new cells. In an aging

　　person the   11    cells may not be as viable（能生存的） or as capable     12     growth as those of a young person.

　　Another factor in aging may be changes within the cells     13 .  Some of the protein chemicals in cells   14    known to change    15   age and become less elastic. This is also the reason old  people shrink（收缩） in    16   . There may be other more important chemical changes in the cells. Some complex cell chemicals，   17    DNA and RNA，store and   18   information that the cells need. Aging may   19    this process and change the information carrying molecules    20   they do not transmit the information as well.

　　（ ）1. A. living   B. alive   C. lively    D. lovely

　　（ ）2. A. result in   B. result from  C. end in    D. conclude

　　（ ）3. A. hands   B. brains   C. organs    D. legs

　　（ ）4. A. made   B. did   C. grew    D. had

　　（ ）5. A. prevention  B. protection  C. strength   D. vitamin

　　（ ）6. A. of    B. to    C. with    D. at

　　（ ）7. A. contribute  B. compare  C. strength   D. be drawn

　　（ ）8. A. fairly   B. much   C. fair    D. fare

　　（ ）9. A. repeated  B. related  C. replaced   D. rearranged

　　（ ）10. A. the amount  B. an amount  C. the number   D. a number

　　（ ）11. A. remaining  B. other   C. old    D. new

　　（ ）12. A. of    B. to    C. with    D. for

　　（ ）13. A. themselves  B. itself   C. by themselves  D. of themselves

　　（ ）14. A. is    B. are   C. was    D. were

　　（ ）15. A. with   B. within   C. for    D. on

　　（ ）16. A. height   B. high   C. heighten   D. higher

　　（ ）17. A. as such   B. as that   C. as though   D. such as

　　（ ）18. A. pass on   B. pass by  C. pass into   D. pass off

　　（ ）19. A. cancel   B. affect   C. influence   D. damage

　　（ ）20. A. so that   B. providing  C. in case    D. if

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