The first people who gave names to hurricanes were those who knew them best — the people of Puerto Rico. The small island of Puerto Rico is in the West Indies, off the coast of Florida. This is wher
已知有如下转化关系：CH3CHOC2H5OHC2H4C2H5Br，则反应①、②、③的反应类型分别为：( ) A．取代、加成、取代 B．取代、取代、加成 C．氧化、加成、
_________ is my friend. _________ name is Tom.A. She; Her B. Her; She C. He; His D. His; He
一个有限项的等差数列，它的前5项的和为34，最后5项的和为146，所有项的和为234，则它的第七项等于
对光合作用图解分析不正确的是 A．图示为C3植物的光合作用过程 B．若突然停止CO2供应，则短时间内三碳化合物的含量将上升 C．
河流的河床形态，受流域内多种因素的影响，下列因素中，对河床形态影响不大的是： A、岩石性质 B、通航里程 C、地质构造 D、降水多
Any spare cash he referred to ________ to more worthy causes.A. has donated B. having donated C. has been donated D. have been donated
下列生物身体呈辐射对称的是（） A、珊瑚虫 B、涡虫 C、蛔虫 D、蝗虫
的倒数是
C．
