单项选择题

From the passage we learn that ________.

A．early starters can learn to speak within only six months
B．children show a strong desire to communicate by making noises
C．imitation plays an important role in learning to speak
D．children have various difficulties in learning to speak

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单项选择题

When was the firm foundation of quantum theory laid

A．In 1913.
B．In 1924.
C．In 1925.
D．In 1927.

单项选择题

Which of the following statements is true

A．Quantum mechanics and uncertainty relations do not have obvious relationship.
B．Quantum theory, which contributes greatly to human beings, developed perfectly.
C．Quantum theory changed physics as well as the whole world picture.
D．Uncertainty principle is as great as Einstein’s concept of relativity.