B．the two girls were born in two different families

　　C．the DNA of a biological parent is still missing

　　D．one girl was born a week later than the other

　　4．What Ramirez said in Paragraph 4

　　suggests that she ________.

　　A．didn’t believe what had happened

　　B．was surprised at what had happened

　　C．didn’t want to accept the fact

　　D．was pleased with what they had done

　　5．What would be the best title for the passage?

　　A．Adopted sisters are reunited

　　B．Adopted sisters live happily in the US

　　C．Suspicion turned into reality

　　D．The stories of two families

　　B

　　The earth，moon，sun and all visible stars in the sky make up less than one percent of the universe. Almost all the rest is dark matter and dark energy，unknown forces that puzzle astronomers.

　　Observations in recent years have changed the basic understanding of how the universe evolved and have indicated how little is known about the major forces and substances that shaped our world.

　　Astronomers now know that luminous(发光的) matter—stars，planets and hot gas... accounts for only about 0.4 percent of the universe. Non­luminous components，such as black holes and intergalactic(星系间的) gas，make up 3.6 percent. The rest is dark matter，about 23 percent，and dark energy，about 73 percent.

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