Tooth decay might also be caused by _________.
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1 .Poisons stay in body for hours or days depending on ______.
A how much alcohol the liver must dispose of B blood oxygen-carrying capacity C Alcohol and tobacco do not mix D smoke less is better E drink a bottle of wine F puff the cigarettes once
2 .Smoking more would contract ______.
A how much alcohol the liver must dispose of B blood oxygen-carrying capacity C Alcohol and tobacco do not mix D smoke less is better E drink a bottle of wine F puff the cigarettes once
3 .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
4 .Lead is known to cause _______in children.
A mental problems B overweight C poisoning D eye disease
5 .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
7 .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
8 .The word “accident” (Para. 2) can be best replaced by ______.
A way B chance C happening D incident
9 .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.
10 .What is the main idea of the passage?
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