ID：9406-6836 Wide-ranging research on tooth decay has recently produced some surprising findings. One indicates that cheddar may actually inhibit the tooth-decay process. It seems to have decay-slowing effect on human teeth if it is eaten immediately after sugar. Why cheese should have such an effect is unknown. It is speculated that the food might interfere with the acid that decays teeth or with bacteria that produce the acid. If so, it would be the first common food found to have this useful property. The other surprising research finding was that heavily sweetened cereals proved about equally potent in causing decay whether they contained eight percent sugar or almost eight times that much. 1. According to the passage, how many of the test results were unexpected? A. One B. Two C. Three D. Eight 2. According to the passage, what effect does cheddar cheese seem to have? A. It interferes with the function of teeth. B. It makes sugar taste sweeter. C. It decreases the rate at which teeth decay. D. It helps in the digestion of food. 3. It can be inferred from the passage that the research on the relationship between cheese and tooth. A. has been discredited B. will be slowed considerably C. has been found to be conclusive D. will be continued 4. Researchers discovered that sweetened cereals were. A. important nutritionally B. all surprisingly heavy in sugar C. more expensive than cheese D. all equally harmful to teeth
ID：9406-6813 （翻译）A pictorial display of an organism,s chromosomes in the coiled, condensed state is known as a karyotype. Karyotype reveal that in most cells all but sex chromosomes are present as two copies, referred to as homologous pairs.
