单项选择题

Which of the following is the most suitable title of this passage

A．How to Develop Children's Potential
B．Studies on Children's Psychology
C．Children's Concept of Abstract Numbers
D．Hob Children Develop Numerical Skills

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单项选择题

It is________to believe that the quantity of water keeps unchanged when it is con tained in two different glasses.

A．easy to persuade children
B．hard for most children
C．innate of most children
D．difficult for both adults and children

单项选择题

According to the first paragraph, gelatin________.

A．is a protein that can be obtained from animals
B．is harmful to human bodies
C．should not be made into a dessert
D．is lacking in tryptophan and arginine