频繁移动地点的作业由现场防护员手持停车手信号防护（）
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Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European colonization.（）
A. emphatically stated
B. belligerently(aggressively) argued
C. accentuated(emphasize)
D. entreated 恳求 （implore, plea, invoke ）
The first paper was made from the bark of the mulberry tree.（）
A. dried wood
B. outer covering
C. syrup(sirup)
D. root
Blue－green algae grow abundantly in salt marshes.（）
A. primarily
B. slowly
C. on plants(cultivate)
D. in great numbers
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