单项选择题

Modem plant breading is largely based on planned hybridization combined with ______ selection to speed up the evolution of new varieties.

A．stringent
B．stem
C．emergent
D．austere
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单项选择题
The poor couple ______ every night over the decision to send their sons to school and keeping their only daughter at home to help with fainting work.
A．agonized
B．descended
C．abated
D．evacuated
单项选择题
Although the two companies talked about how little ______. there is between them, they still expect to eliminate about 10000 positions from among a combined work force of 140,000 after their mergence.
A．overlap
B．combination
C．congregation
D．inundation
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