高热、胸痛、呼吸急促血性泡沫痰，X线胸片提示支气管肺炎改变。和败血症型鼠疫有黑死病之称的是E．
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The critics' camp is worried that ______.
A. education may suffer in the wake of technology
B. anti-technology sentiment is growing
C. politics may shape technology
D. education may not keep up with technology
几何平均收益率一般可以用作对平均收益的无偏估计。()
A. 正确
B. 错误
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