单项选择题

Where does this article probably occur

A．A magazine.
B．A physics textbook.
C．A physics report.
D．A government document.
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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.
单项选择题
Postal ______ are determined by the class and weight of the parcel mailed.
A．taxes
B．payment
C．fees
D．premium
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