Neither he nor I _________ from Canada; we are from Australia. A. is B. are C. am D. was
如图，直线y=kx（k＞0）与双曲线y=交于A、B两点，若A、B两点的坐标分别为（x1，y1），（x2，y2），则x1y2+ x2y1的值为（ ）. （A）-4.
根据句意，用括号内所给词的适当形式填空。 1. __________（luck），he passes the exam. 2.It’s five ______(minute) walk from my home to my school. 3. He lives on the___________(
（2009·宁夏中考）一束光从地球到月球需要1.27 s，则地球到月球的距离是_____m.
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（本小题满分12分） 已知函数，曲线在点处的切线方程为． （I）求a，b的值； （II）证明：当x>0，且时，．
I really can’twith the loud noise outside. It is driving me crazy. A. come up B. put up C. push ahead
下列说法正确的是 A．液态HCl、固态NaCl均不导电，所以HCl、NaCl是非电解质 B．NH3、CO2、Cl2的水溶液均能导电，所以NH3、CO2、Cl2均是电解质 C．蔗糖、酒
