36.Why does the author mention“pyramid builders”?
A.Because they once worked miracles.
B.Because they were well-built.
C.Because they were actually very weak.
D.Because even they were unable to rescue their civilization.
37.Which of the following factors was ultimately responsible for the fall of the civilization of ancient Egypt?
A.Change of climate.
B.Famine.
C.Food.
D.Population growth.
38.Which of the following statements is true?
A.The White Nile is the trunk of the River Nile.
B.The White Nile is the trunk of the Blue Nile.
C.The White Nile is a branch of the Blue Nile.
D.The White Nile and the Blue Nile are branches of the River Nile.
39.According to Krom，Egypt’s Old Kingdom fell
A.immediately after a period of drought.
B.immediately after a period of flood.
C.just before a drought struck.
D.just before a flood struck.
40.The word‘'devastating”;in the last paragraph could be best replaced by
A.“frustrating”.
B.“damaging”.
C.“defeating”.
D.“worrying”.
41.Which of the following is the result.if a sunbather stays ON the beach for a long time?
A.The skin cancer.
B.The wrinkles that cannot be seen.
C.All kinds of sacrifices.
D.Healthful beauty.
42.Which of the following is not a possible damage by UV radiation?
A.Sunburn.
B.The loss of skin elasticity.
C.Thickness of epidermis.
D.The deterioration of dermis.
43.Why may the repair process of the DNA finally fail?
A.Because shortwave radiant energy breaks the strands of the DNA.
B.Because the DNA may produce a colony of cancer cells.
C.Because enzymes work to rearrange the DNA into a new order.
D.Because the patient is exposed to UV from time to time.
44.According to the passage，which of the following is not right?
A.People who have already had one skin—cancer growth can not develop cancer again.
B.It is better for a person to go out before 11 a.m.and after 3 P.m.if possible.
C.Anyone who insists on sunbathing should use a good sunscreen.
D.Checks，nose，lower lip and the ears are special danger spots.
45.The main idea of the last paragraph is
A.the treatment of the skin cancer.
B.the prevention of the skin cancer.
C.the parts of the body where cancer is most likely to develop.
D.the lotions that work best in fighting against the skin cancer.
