单项选择题

A．They were influenced by his background in engineering.
B．They were very expensive to take.
C．They were among the first taken under such condition.
D．Most of them were of poor quality.
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单项选择题
According to the passage, why is plankton considered to be more valuable than land grasses
A．It is easier to cultivate.
B．It produces move carbohydrates.
C．It does not require soil.
D．It is more palatable.
单项选择题
A．Because she is the assistant to Dr. Collin.B．Because she wants to show off herself.C．Because she has read a lot on DME.D．Because she knew the man is absent from the class.
A．Because she is the assistant to Dr. Collin.
B．Because she wants to show off herself.
C．Because she has read a lot on DME.
D．Because she knew the man is absent from the class.
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