We have to admit that the biggest___________ facing the ecosystem is limited resources and the worsening environment.
#12389
A
mission
B
challenge
C
scale
D
contribution
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(2011·上海高考)Today we have chat rooms, text messaging, emailing ... but we seem ________ the art of communicating facetoface.
#11376
A
losing
B
to be losing
C
to be lost
D
having lost
One of the advantages of living on the top of a high building is that you can get a good ______.
#12137
A
sight
B
scenery
C
appearance
D
view
As the quality of the city’s air continues to give rise to ______, the residents are encouraged to set off fewer fireworks.
#11625
A
concerns
B
descriptions
C
catastrophe
D
emergency
On account of fuel supplies being finite and many people being wasteful, we will have to install ________ solar heating device in our home.
#12909
A
some type of a
B
some types of a
C
some type of
D
some types of