What is the main idea of the passage?
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1 .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
2 .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
3 .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
4 .The word “accident” (Para. 2) can be best replaced by ______.
A way B chance C happening D incident
5 .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.
7 .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.
8 .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
9 .1.
A scientists B humans C plants D animals
10 .2.
A insects B birds C fish D snakes
