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【单选题】
图示为一具有球对称性分布的静电场的E-r关系曲线，请指出该静电场是由下列哪种带电体产生的【图片】A.
半径为 R 的均匀带电球面
B.
半径为 R 的均匀带电球面
C.
半径为 R 、电荷体密度 r =Ar （ A 为常数）的非均匀带电球体
D.
半径为 R 、电荷体密度 r =A/r （ A 为常数）的非均匀带电球体
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A.
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B.
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【单选题】Although there is no easy cure for SARS at present, some of its causes have been ______ by experts.
A.
rebelled
B.
distracted
C.
bolted
D.
identified
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A.
anticipate
B.
participate
C.
cooperate
D.
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A.
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B.
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D.
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