C.To test their suspicions.
D.To know how to adopt children.
18.Experts are still not 100 percent sure that the two girls are fraternal twins because ________.
A.DNA tests are still not accurate enough
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
19.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
20.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 FamiliesB
(建议用时8′)
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.
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