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A.A planet with water. | B.A planet similar to the earth. |
C.A planet without life. | D.A planet near the earth. |
A.is at the right distance from its star | B.moves around the earth |
C.is as far away from us as the moon | D.can be reached in about 220 years |
A.the possibility of living on Gliese 581g |
B.the kinds of chemicals around Gliese 581g |
C.the way of looking for life on Gliese 581g |
D.the aim of studying the radiation on Gliese 581g |
A.Gliese 581g, a Likely Living Planet | B.Gliese 581, a Likely Living Planet |
C.Gliese 581g and Its Star | D.Gliese 581g and Radiation |
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A.a, d, b, c | B.a, b, d, c | C.d, a, c, b | D.d, c, a, b |
A.Tired. | B.Bored. | C.Nervous. | D.Frightened. |
A.Practice makes perfect. | B.The early bird catches the worm. |
C.No pains, no gains. | D.Pride goes before a fall. |