单项选择题

The shrinking range poses______to Africa’s elephants．

A．a graver threat that is long－term．
B．long－term the gravest threat．
C．the gravest long－term threat．
D．a long－term threat graver．
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单项选择题
______，the condor in Peru is threatened by the rapid encroachment of humans．
A．As isolated as its few remaining habitats may be．
B．As its few remaining isolated habitats may be．
C．May its few remaining habitats be as isolated．
D．Its few remaining habitats may be as isolatcd．
单项选择题
Birds that breed on high cliffs have pear－ shaped eggs that roll in a tight circle，making______less likely to roll off the cliff．
A．somewhere
B．sometimes
C．something
D．somewhat
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