[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

[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

[填空题]Rice is one of the major GM crops containing genes which help to either resist insect or tolerate weed - killing herbicides.

[填空题]Rice is one. of the major GM crops containing genes which help to either resist insect or tolerate weed - killing herbicides.

[单项选择]Body paint or face paint is used mostly by men in preliterate societies in order to attract good health or to （）disease.
A. set aside
B. ward off
C. shrug off
D. give away

[填空题]What information does the lead provide
A lead answers certain questions that might be asked by ______.

[简答题]to paint the lily

[填空题]

A Major Composer

Ludwig van Beethoven, a major composer of the nineteenth century, overcame many personal problems to achieve artistic greatness.
Born in Bonn, Germany, in 1770, he first studied music with the court organist, Gilles van tier Eeden. His father was excessively strict and given to heavy drinking. (46) . Appointed deputy court organist to Christian Gottlob Neefe at a surprisingly early age in 1782, Beethoven also played the harpsichord and the viola. In 1792 be was sent to Vienna by his patron, Count Ferdinand Waldstein, to study music under Haydn.
Beethoven remained unmarried. (47) Continually plagued by ill health, he developed an ear infection which led to his tragic deafness in 1819.
(48) . He completed mature masterpieces of great musical depth: three piano sonatas, four string quartets, the Missa Solemnis, and the 9th Symphony. He died in 1827. (49)

[填空题]What kind of life she would lead She would lead ______ life.

[单项选择]
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. children at 12 months of age.
B. children whose doctors advise them taking the test.
C. men at risk for high blood pressure.
D. women at risk for hypertension.