单项选择题

A decimum was ______.

A．a written contract
B．a gift of money to the new husband
C．the wife' s inheritance from her father
D．the wife' s right to receive one-tenth of her husband' s property
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单项选择题
The passage suggests which of the following about the increased resistance to harmful root fungi that some Plants infected with mycorrhizal fungi seem to exhibit
A．There are at least three hypotheses that might account for the increase.
B．The plants that show increased resistance also exhibit improved nitrogen fixation.
C．Such increases may be independent of mycorrhizal infection.
D．It is unlikely that a satisfactory explanation can be found to account for the increas
单项选择题
It can be inferred from the passage that which of the following has been a factor influencing the extent to which research on mycorrhizal fungi has progressed
A．Lack of funding for such research
B．lack of immediate application of such research
C．difficulties surrounding laboratory production of specimens for study.
D．lack of a method for identifying mycorrhizal fungi
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