单项选择题

We can infer from the fifth paragraph that

A．the lidar detector can successfully forecast turbulence.
B．researchers are not sure about the effectiveness of the lidar detector.
C．passenger planes will be used in further experiments.
D．no more test flights are needed.

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热门试题

单项选择题

The turbulence detector can tell the severity of the turbulence by measuring

A．the speed of the plane.
B．the speed of the light.
C．the number of particles in the air.
D．the changes of the particles' speed.

单项选择题

Thousands of Irish people starved during the Potato Famine because

A．they were so dependent on potatoes that they refused to eat anything else.
B．they were forced to leave their homeland and move to America.
C．the weather conditions in Ireland were not suitable for growing potatoes.
D．the potato harvest was bad.