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弱光下，以为主要氮源的植物表现出缺氮症状。（)
弱光下，以
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更多“弱光下，以为主要氮源的植物表现出缺氮症状。（)”相关的问题
第4题
The relationship between words and things in the world is established by means ofA．referen
The relationship between words and things in the world is established by means of
A．reference.
B．sense.
C．concept.
D．meaning.
第5题
The World Heritage List was established under terms of the Convention Concerning the Protection of the World Cultural and Natural Heritage adopted in 1972 by UNESCO.
第6题
Protecting the earth is a worldwide question because ______A．pollution is everywhere in th
Protecting the earth is a worldwide question because ______
A．pollution is everywhere in the world
B．polluted air and water in one place affects distant areas
C．people all over the world are responsible for the pollution problem
D．all of the above
第8题
The United Nations was established for the purpose of safeguarding the world from a repeat
of WWII.
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A．Y
B．N
C．NG
第9题
A world authority should be established to regulate fishing beyond ______ of individual st
ates.
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