The word “accident” (Para. 2) can be best replaced by ______.
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1 .American researchers say that lead poisoning may be the cause of tooth damage in ____ children in the U.S.
A almost 1 million B more than 2 million C almost 2 billion D about 57 million
2 .Lead is known to cause _______in children.
A mental problems B overweight C poisoning D eye disease
3 .Exposure to lead has fallen sharply _______.
A because scientists have warned people of its danger B after the research was done C as people moved out of old houses D since it was removed from paint and gasoline
4 .Tooth decay might also be caused by _________.
A a lack of Vitamin C B diets high in sugar C water containing fluoride D food with too much acid
5 .A study by the University of California showed ___________.
A Vitamin C could prevent tooth decay B Vitamin C could prevent lead poisoning C people with more Vitamin C in their blood have lower lead level D adults and children have different lead levels in their blood
7 .According to the passage, during the experiment, why did the screen glow?
A Because the light was on. B Because it was very bright. C Because it was barium compound. D Because of X-rays.
8 .What is the main idea of the passage?
A Roentgen discovered X-rays. B The usage of X-rays. C An experiment made by Roentgen D The discovery of X-rays and its medical usage.
9 .According to the passage, which of the following is NOT true?
A Eating less than usual might make us live longer. B If we go on a diet when old, we may keep healthy. C Dieting might not be needed. D We have to begin dieting from childhood.
10 .According to the last two paragraphs, Sindler believes that____.
A calorie restriction is very important to young people B seeing the effect of a diet, people will eat less than normal C dieting is not a good method to give us health and a long life D drugs do not have the effects of calorie restriction
