单项选择题

Which of these statements is true ( )

A．About half of Panama lies east of Miami.
B．Panama is squeezed into the narrowest portion of Central America.
C．Panama offers the lowest point in the North American continental divide.
D．All of the above are true.

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单项选择题

The canal was built with the help of ______. ( )

A．the airplane
B．the automobile
C．both the plane and the automobile
D．neither the plane nor the automobile

单项选择题

Which of the following is not conceit but a cry for reassurance ( )

A．An urgent need for contact with adult.
B．A child's efforts to be independent.
C．A child's unsureness.
D．A child's making statements about his own cleverness.