单项选择题

According to the passage, today’s ultralight airplanes ______.

A．are inexpensive but difficult to fly
B．are more like go-karts than like hang gliders
C．cannot climb as fast or as high as hang gliders
D．are not too different from the earlier aircraft

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单项选择题

Which of the following statements is TRUE

A．The Egyptian signs later became a particular alphabet.
B．The Egyptians liked to write comic-strip stories.
C．The Roman alphabet was developed from the Egyptian one.
D．The Greeks copied their writing system from the Egyptians.

单项选择题

The Greek alphabet was simpler than the Egyptian system for all the following reasons EXCEPT that ______.

A．the former was easy to write
B．there were fewer signs in the former
C．the former was easy to pronounce
D．each sign stood for only one sound