B.the Mayas were excellent builders and farmers
C.he had experienced so may difficulties to find this lost civilization
D.it described that the Mayas used to be an advanced civilization
47.One of the most surprising findings about Mayas was that .
A.they developed accurate system measuring time
B.they knew how to build pyramids with stones
C.they deserted their cities and moved to new ones
D.they built cities which they never lived in
48.Mayas civilization collapsed probably in .
A.a thousand years before 1841 B.around AD 900
C.any year between 1200 and 1517 D.AD1200
49.What brought about Mayan sudden collapse?
A.Tropical germs and diseases B.European conquest
C.Mysterious force from outer space D.No one knows for sure
B篇
The food we eat seems to have a great effect on our health. Although science has made big steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of human illness is related to food and forty percent of cancer is related to food as well. That food is related to illness is not a new discovery. In 1945, some researchers realized that things commonly used to keep colour in meats and other food additives(添加剂)caused cancer.
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