单项选择题

Indeed,（）may develop in behavior occurring between different species.

A. expectation
B. reciprocation
C. specification
D. visualization

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单项选择题

The sense of trust in an infant is under development when （）

A. the infant experiences some satisfaction
B. adults’ trust is adequate
C. the infant learns how to move
D. the infant is surrounded by people he can recognize

单项选择题

The title below that best expresses the main idea of this passage is（）

A. Trinidad and Tobago, A Young Country
B. Two Islands
C. Trinidad’s Attraction to Tourists
D. Sugar Cane Production