Many species of wild animals which once lived on the earth are no longer in ______.
A. appearance
B. reality
C. challenge
D. existence
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Painting belongs to Chinese “Three ______”.
A. Perfections
B. Performs
C. Perfects
D. Performers
In Beijing Opera, black stands for ______.
A. valor
B. loyalty
C. uprightness
D. trickster
Computer-controlled machines are able to take ______ and perform tasks.
A. construction
B. instructions
C. instruments
D. intelligible
In the past few _____, there has been a great increase in the amount of research done on human brain.
A. ten years
B. decade
C. ten year
D. decades