A.A few comets are moving to the direction of Earth. |
B.Earth’s working life is coming to an end soon. |
C.Earth will become too hot for mankind to keep alive. |
D.The moon is moving farther and farther away from Earth. |
A.12 billion | B.6 billion |
C.18 billion | D.24 billion |
A.The comet might hit Earth and man might lose the moon. |
B.Earth might be moved too far away and man might be frozen to death. |
C.The comet might hit Jupiter or Saturn and never return to Earth. |
D.Earth’s working life might be greatly shortened. |
A.provide | B.benefit |
C.share | D.Endanger |