“Do you ____ English at the English corner?” “A little.” A. say B. speak C. talk D. tell
圆心在直线y＝x上，经过原点，且在x轴上截得弦长为2的圆的方程为( ) A．(x－1)2＋(y－1)2＝2 B．(x－1)2＋(y＋1)2＝2 C．(x－1)2＋(y－1)2＝2或(x＋1)2＋(y＋1)2
No sooner had he got home than he ____his coat and sat down at the table. A. threw off B. threw out C. threw about D. threw sway
下列关于体液免疫和细胞免疫的叙述，正确的是 A．体液免疫具有特异性，细胞免疫没有特异性 B．浆细胞和效应T细胞均能产生抗体 C．B细胞的增殖、分
史书记载：西周初年分封了71个诸侯，诸侯在封国内享有世袭统治权，并对周天子承担朝贡、提供赋役等义务。这反映西周实行 A．行省制 B．
_______ is no trouble that the Dallas Mavericks will defeat the Washington Wizards in the next game. A. It B. As C. That D. There
｝, B={x| 
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｝, B={x| 
} 求
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；
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