Don't blame genes for aging facial skin. A new study of twins suggests you can   1   those coarse(粗糙的) wrinkles, brown or pink spots, and dilated(膨胀的) blood vessels on too much time in the sun, smoking, and being overweight.

Because twins share genes, but may have  2  exposures to environmental factors, studying twins allows an, "opportunity to control for genetic susceptibility(敏感性)," Dr. Elma D. Baron, at Case Western Reserve School of Medicine in Cleveland, Ohio, and colleagues  3  in the latest issue of Archives of Dermatology.

Their analysis of environmental skin-damaging factors in 65 pairs of twins hints that skin aging is  4  more to environment and lifestyle than  5   factors.

But when it   6   skin cancer, the researchers say their findings support previous reports that   7  environment and genes affect skin cancer risk.

Baron's team   8   facial skin of 130 twins, 18 to 77 years old, who lived  9   in the northern Midwest and Eastern regions of the U.S. who were  10   the Twins Days Festival in Ohio in August 2002.

At this time, each of the twins also  11    reported how their skin burned or tanned  12    sunscreen(防晒霜), their weight, and their history of skin cancer, smoking, and alcohol drinking.

The study group   13   of 52 fraternal and 10 identical twin pairs, plus 3 pairs who were unsure of their twin status. Identical(同卵的) twins share all of their genes and fraternal twins share only about half.

From these data, the researchers  14  strong ties, outside of twin status, between smoking, older age, and being overweight, and having facial skin with evidence of environmental  15 

 16   contrast, sunscreen use and drinking alcohol appeared correlated with   17    skin damage.

Baron and colleagues say the current findings, which highlight ties between facial   18  and potentially avoidable  19   factors -- such as smoking, being overweight, and   20   overexposure to the sun's damaging rays -- may help motivate people to minimize these risky behaviors.

(    ) 1. A. blame                     B. owe                 C. take                 D. bring

(    ) 2. A. same                       B. different           C. similar             D. common

(    ) 3. A. explain                    B. confirm            C. declare             D. shout

(    ) 4. A. equal                             B. related              C. close                D. strict

(    ) 5. A. characteristic           B. personal           C. natural             D. genetic

(    ) 6. A. comes to                 B. talks of             C. refers to           D. gets to

(    ) 7. A. all                          B. neither             C. both                 D. either

(    ) 8. A. examined                B. checked            C. inspected          D. interviewed

(    ) 9. A. most                       B. usually             C. mostly              D. always

(    ) 10. A. joining                  B. representing      C. attending          D. remarking

(    ) 11. A. separately              B. lonely              C. commonly               D. truly

(    ) 12. A. with                             B. on                    C. in                    D. without

(    ) 13. A. consisted                      B. made up          C. contained         D. included

(    ) 14. A. documented           B. recorded           C. reported           D. noted

(    ) 15. A. damage                 B. exploration       C. protection         D. material

(    ) 16. A. In                         B. By                   C. As                    D. At

(    ) 17. A. lesser                    B. more                C. no                    D. fewer

(    ) 18. A. look                             B. aging                      C. expression               D. wrinkle

(    ) 19. A. environmental               B. genetic             C. emotional         D. psychological

(    ) 20. A. protected                      B. planned            C. unprotected       D. prevented

Be careful when you cross this very busy street. If not, you may ________ run over by a car.

1. A.
   have
2. B.
   get
3. C.
   become
4. D.
   turn

Most Americans would prefer to keep their problems _____themselves, and solve their problems ______ themselves.

A. to; by                      B. by; to                      C. for; to                     D. in; on

I was in the kitchen making lunch when I saw my six-year-old son, Billy, walking toward the woods. I could only see his back. He  56   to be walking with a great effort, trying to be as  57  as possible.

    A few minutes after he disappeared into the   58  , he came running toward the house again. I went back to making sandwiches,   59   that whatever task he had been doing was completed. Moments later,  60  , he was once again walking slowly toward the woods.

      61  curiosity, I walked out and followed him on his journey. He was  62   both hands in front of him as he walked, being  63   not to spill the water he held in them. I secretly walked   64   behind him as he went into the woods and I saw the most amazing  65  .

    Several large deer loomed in front of him. Billy walked right up to them. I almost  66   at him to get away. A huge male deer with elaborate（精美的）antlers was   67   close. But they didn’t even move as Billy   68  . And I saw a small deer lying on the ground, obviously suffering from   69  and extreme heat, lift its head  70   to drink the water cupped in my beautiful boy’s hands.

    It was on this day that I learned the true lesson of  71  . You know, we hadn’t had any rain for three months and our crops were   72 . As the tears that rolled down my face began to hit the ground, they were suddenly   73   by other drops. I looked up at the sky. It was  74   God was moved to weep. The rain came that day and saved our farm, just like the  75  of one little boy who saved another.

A. happened B. seemed       C. managed    D. intended

A. quickly    B. secret  C. smoothly    D. still

A. distance   B. yard    C. woods D. park

A. wondering      B. thinking         C. studying     D. doubting

A. eventually       B. actually         C. however     D. therefore

A. Within     B. Out of     C. Beyond      D. In spite of

A. holding   B. waving   C. surrounding      D. cupping

A. careful    B. worried      C. eager  D. prepared

A. away       B. close   C. out     D. off

A. scene       B. story   C. view   D. game 

A. fought     B. signed C. screamed    D. waited

A. hardly     B. dangerously     C. easily  D. nearly

A. ran away B. turned out        C. knelt down D. settled down

A. hunger    B. disease       C. thirst   D. injury

A. in turn     B. in silence        C. with appreciation      D. with difficulty 

A. suffering B. supporting       C. sharing       D. depending

A. dying      B. reducing         C. harvesting  D. growing

A. hidden     B. covered      C. joined D. caught

A. when       B. as if    C. because      D. that

A. wish B. dream C. action D. expectation