单项选择题

If, in making a vowel sound, tile organs of speech remain in one position without moving to another, the result is a______.

A．pure vowel
B．close vowel
C．diphthong
D．closing diphthong
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单项选择题
In Britain the last stage for a bill to become law as Acts of parliament' is called______.
A．First and Second Readings
B．Royal Assent
C．Third Reading
D．Committee stage
单项选择题
Which of the following is the best solution to the problems mentioned in the passage
A．The designing of highly efficient car engines.
B．A reduction of vehicle use in cities.
C．The development of electric cars.
D．The use of less polluting fuels.
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