更多"The level of lead contamination in "的相关试题:
[单项选择]In the wake of such findings, several states are rethinking their plan to open these camps（ ）.
A. Based on
B. Preceding
C. Following
D. Targeted at
[单项选择]Suppose money supply and the general price level remain the same, and money demand is the function of income and interest rate, an increase in incomes will ______.
(a)increase both money demand and interest rate.
(b)increase money demand but lower interest rate.
(c)decrease money demand but increase interest rate.
(d)decrease money demand and interest rate.
[填空题]When an earthquake with level 7 in Richter scale rating is reported it means that its amplitude is ______ times stronger than a level 6 earthquake.
[单项选择]In the United States, the black people are often referred to as "______" in which the colour of their skin that caused them troubles and sufferings is not mentioned in English euphemisms.
A. niggers
B. Negroes
C. the black
D. African Americans
[单项选择]
The United States has hosted the Olympic Games a record eight times. St. Louis, Los Angeles (twice) and Atlanta have been the sites of the summer Games while Lake Placid (twice). Squaw Valley and Salt Lake City in 2002 have welcome the winter Games.
Ten U. S. cities have entered the process to become the candidate city for the 2010 Olympic Games which will be selected by the U. S. Olympic Committee Board of directors. The U. S. city will then face competition from around the world with the International Olympic Committee making the final decision.
The 10 cities have until the spring of 2000 to prepare their final bids for the USOC. Following site evaluations and the XLXth Olympic Winter Games in Salt Lake City, Utah (Feb. 8-24,2002), the U. S. Olympic candidate city will be elected in the fall of 2002 at the USOC’s Board of Direction meeting. The closing date for all worldwide candidate cities to submit bids to the International Olympic will be in the winter
A. vice president of USOC
B. president of IOC
C. president of USOC
D. vice president of IOC
[单项选择]Which two states have declared states of emergency（ ）.
A. Carolinas and New England.
B. Connecticut and New Jersey.
C. Vermont and New York.
D. Pennsylvania and Maine.
[填空题]What kind of life she would lead
She would lead ______ life.
[单项选择]
Lead Poisoning: A Silent Epidemic
How much lead is harmful Until the 1970s, exposure to lead was considered dangerous only at blood levels associated with extreme symptoms of poisoning: convulsions (惊厥), brains swelling, acute kidney disease, stomach pains and hallucinations (幻觉). But low -level lead poisoning can cause symptoms that, while subtle, are no less serious. As a result, the CDC has continually lowered the point at which patients should be treated for lead poisoning.
One of the most influential study of lead’ s low - level effects was published by Herbert Needleman, professor of psychiatry at the University of Pittsburgh Medical School. Testing first and second grade students in the Boston area, he found the lowest I. Q. , academic achievement, language skills and attention span among children with the highest tooth levels (起损害作用的量) of lead. "None of their lead levels exceed the CDC’s 1979 toxicity threshold. "Says Paul Mu
A. the amount of exposure was large.
B. it caused extreme symptoms of poisoning.
C. it caused symptoms whether serious or not.
D. poisoning had led to death among the poisone
[填空题]Paint containing lead is a major (11) of lead poisoning in children. The heavy metal enters the body when children breathe the paint dust or fumes in the (12) Or when babies put their mouth on painted surfaces or swallow pieces of paint. Lead can (13) the brain and the nervous system. It can decrease intelligence, create behavior problems and slow a child’s (14) . Researchers tested new household enamel paints from twelve countries in Africa, Asia and South America. The paints were sold under different (15) names. The study found that almost three-fourths of the brands had dangerously high levels of lead.Paint containing lead is a major (11) of lead poisoning in children. The heavy metal enters the body when children breathe the paint dust or fumes in the (12) Or when babies put their mouth on painted surfaces or swallow pieces of paint. Lead can (13) the brain and the nervous system. It can decrease
