单项选择题

What's Kirkwood Gap

A．A belt located between Mars and Jupiter.
B．Different regions in the asteroid belt.
C．The mysterious gap between different regions of the asteroid belt.
D．Ceres, a ball about 637 miles in diameter.

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单项选择题

What caused photosynthesis to stop

A．Thousands of species died of starvation.
B．Earthquake and tidal waves.
C．Massive volcanic eruptions and forest fires.
D．Tons of dust and pulverized rock blasted into the atmosphere and blocked out sunlight.

单项选择题

What is the meaning of unleashed in Par

A．3A. To control.B. To check.C. To whip with a leash.D. To releas