What is the mystery that researchers find hard to explain、-最需题库

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1In the last paragraph the word "persistent means
A.important.
B.effective.
C.enduring.
D.visibl
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2Infiniteness sunspot activity had occurred in 1857, the next one would have been in
A.1858.
B.1862.
C.1865
D.1868
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3The leading spot and the following spot are the names of
A.two large sunspots.
B.a large spot and a small spot.
C.the two spots in a spot pair.
D.the central core and the ring around it.
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4Sunspots are cooler than the rest of the sun's surface because
A.they produce less energy.
B.they are buried in the sun.
C.they are far away from magnetic fields.
D.they are close to magnetic fields.
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5Careful observations and systematic studies of sunspots
A.were made by ancient astronomers.
B.started in the early 17th century.
C.were made by Galileo only.
D.could be made without a telescop
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6Researchers are seriously concerned with the phenomenon of colony—collapse disorder because
A.honeybees help produce one-third of the foods we eat
B.parasites on bees may spread everywhere.
C.honeybees cannot find enough food elsewhere.
D.honeybees feed on flowers.
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7Which of the following is a possible cause of the colony-collapse disorder、
A.Population explosion.
B.Decreasing number of flowers around.
C.Genetically modified products.
D.Diseases and chemicals.
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8Which of the following explanations is given by Jerry Hayes to the phenomenon、
A.Bee-keepers do not understand the honeybee’s behavior.
B.A certain type of chemical destroys the honeybee’s newels system.
C.Honeybees are infected by unwanted insects.
D.Some crops are poisonous to the honeybees.
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9The word “diversity’ in the last paragraph means
A.variety.
B.makeup.
C.disorder.
D.distinction.
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10What is Sunset Song mainly about、
A.The First World War.
B.The beauty of the sunset.
C.The new European worl
D.D.The lives of rural Scottish farmers
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