单项选择题

According to the talk, what did David Sarnoff predict about radios

A．They would get smaller in size.
B．Their signals would travel further.
C．They would become less popular than television.
D．They would be common household items.
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单项选择题
Why is the second theory sometimes referred to as the Mars Theory
A．Earth’s moon used to orbit Mars.
B．Mars was captured by the gravitational field of the Sun,
C．A planet the size of Mars collided with Earth.
D．Mars is larger than Earth.
单项选择题
Why does the man want to take a class at the community college
A．Its courses cost less.
B．It has a pool.
C．The class size is smaller.
D．It may offer the class he needs during the day.
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