单项选择题

We can hardly find black flowers because ______.

A．they are easy to be eaten by animals
B．there are no black flowers in the world
C．the petals of black flowers are too strong
D．the light waves make the flowers dry up

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热门试题

单项选择题

The red, orange and yellow lights contain ______.

A．less heat than the other lights
B．more heat than the other lights
C．a great deal of heat
D．a little heat

单项选择题

In the text, it's a chance in a million. (Line 2, Para. 1) means that ______.

A．it is common
B．it's extremely unusual
C．it's lucky
D．it's impossible