单项选择题

The Clever Hans’s real talent was（）

A．his sensitivity to crowd reaction
B．adding large sums
C．standing quietly on stage
D．obeying his owner

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热门试题

单项选择题Land which is too poor to sustain cattle might be used to raise（）

A．horses
B．oxen
C．sheep
D．dairy cows

单项选择题Trees that grow faster are developed by （）

A．planting many trees and fertilizing them
B．collecting seeds from strong, slow growing trees
C．selecting the seeds of the fastest growing trees
D．feeding them high-energy plant foods