单项选择题

______ the earth to be flat, many feared that Columbus would fall off the edge of the earth.

A. Believe

B. Believing
C. Being believed
D. Believed
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单项选择题
Sonia, that is a nice-looking mini-skirt you ______ today.
A. have on

B. wear on
C. put out

D. dress in
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.
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