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 attempt and offer to carry out cloning experiment on human being is blameworthy and can hardly find any ______ among the public not only in our country but also in most of the countries in the world.
A．conscience
B．consensus
C．sensation
D．discord
单项选择题
Fame happened almost overnight for the 25-year-old actress, but she has become ______ by all the recent media attention and now she has got quite used to her life.
A．perturbed
B．unfazed
C．frustrated
D．dissuaded
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