单项选择题

What is implied in Paragraph 4

A．Children with truthful cry may eventually draw their mothers' attention.
B．Noisy infants are preferred by their mothers for their health and strength.
C．Mothers would rather nurse the obedient babies.
D．Mothers tend to ignore the deceitful cry.

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单项选择题

Which of the following statement is true according to the passage

A．Scientists discovered why animal infants cry.
B．The difference in the mount of children's cry is somewhat due to genes.
C．Babies have a violent reaction to the mother's ignorance.
D．Chimpanzees' annoyance can hardly be alleviated.

单项选择题

What brings trouble to fast food industry

A．Customers' demand and competition with retailers.
B．The aging baby-boomer and diversity of food.
C．Competition with retailers and diversity of food.
D．Customers' demand and the aging of baby-boomer.