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【单选题】
生物碱多存在于( )A.
单子叶植物
B.
双子叶植物
C.
蕨类植物
D.
裸子植物
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举一反三
【单选题】We can't have lunch at the restaurant, because ________. [ ]
A.
all of us don't have money
B.
not all of us have money
C.
everyone of us don't have money
D.
none of us have money
【单选题】Structural unemployment can be caused by all of the following EXCEPT:
A.
minimum wages.
B.
labor unions.
C.
efficiency wages.
D.
fluctuations in the business cycle.
【单选题】All of us have read thrilling stories in which the hero had only a limited and specified time to live. Sometimes it was as long as a year, sometimes as short as 24 hours. But always we were interested...
A.
To prove that life is full of twist and turns.
B.
To raise a question to us, regarding the author's topic.
C.
To persuade us not to do anything illegal.
D.
To highlight the importance of health.
【单选题】下列关于光对光合作用的影响,说法正确的是
A.
光照低于光补偿点时,植物的光合速率极低
B.
光照低于光补偿点时,植物的光合速率极高
C.
光合速率随光照强度的增加而增加
D.
光合速率随光照强度的增加而减少
【单选题】We can’t have lunch at the restaurant, because _________．
A.
all of us don’t have money
B.
not all of us have money
C.
everyone of us doesn’t have money
D.
none of us has money
【简答题】All of us have read thrilling stories ______ (故事中的主人公只能活一段很有限的时光)．
【单选题】Cyclical unemployment is caused by
A.
people entering the labor force to search for jobs.
B.
technological progress, which causes some industries to expand employment and others to reduce employment.
C.
reducing international trade barriers, which causes some industries to expand employment and others to reduce employment.
D.
business cycle fluctuations
【单选题】We can't have lunch at the restaurant, because __________.
A.
not all of us have money
B.
all of us don't have money
C.
everyone of us don't have money
D.
none of us has money
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