2011年5月4日是“五四运动”92周年。五四运动孕育了“爱国、进步、民主、科学”的伟大五四精神，其核心是伟大的爱国主义。坚持爱国主义，必须弘扬
There is no point advocating banning smoking in public________ the law is introduced. A．when B．unless C．since D．because
Telepathy: Mind-to-mind Contact Telepathy is the ability to communicate without the use of the five senses (sight, hearing, touch, smell, taste). It’s an instinct (本能) which can be woken up i
加成反应也是有机化学中的一类重要的反应类型，下列各组物质中不能全部发生加成反应的是( ) A．乙烷、乙烯
下列不属于生态系统的是（ ）A、一片农田 B、一块草地 C、生物圈
人造地球卫星运行时，其轨道半径为月球绕地球运行的轨道半径的，若月球绕地球运行周期大约为27天，则此卫星运行的周期大约是( )A．2天
It will be less than a fortnight_______ we get to a turning point in our life. A. since B. when C. if D. before
-- Would you like to have dinner with me? -______ Where shall we eat?A．Sorry, I'm busy.B．I'm afraid I can't.C．I'd love to.D．Good night!
