已知四边形ABCD，有①AB∥CD；②AB=CD；③BC∥AD；④BC=AD. 从这四个条件中任选两个, 能使四边形ABCD成为平行四边形的选法种数，共有( )A．3种
I spent the whole day repairing the motorbike. The work was ____ simple. A、nothing but B、anything but C、something of D、all except
书面表达 爱悄深，母爱无价;学会感恩，学会回报。某英语网站举办以“My mother”为题的英语征文活动。请你根据下列思维导图提供的信息，写一篇短文
Many people do not realize the importance of health they have fallen ill. A. since B. until C. while D. after
为测树的高度，在水平地面上选取A、B两点（点A、B及树的底部在同一直线上），从A、B两点分别测得树尖的仰角为30°，45°，且A、B两点间的距离为60m，
下列物质的性质属于化学性质的是 （ ） A． 颜色、状态 B． 溶解性 C． 密
I know there are many interesting and useful jobs but I would like to be a teacher.I began to think about my future job at the age of fourteen. I was born into a family of teachers. My parents are bot
科学文化修养和思想道德修养是一个人应当同时具备的基本素养。下列古语中蕴含二者关系的有 ①“富贵不能淫，贫贱不能移，威武不能屈”(战国·孟
，
，
，则
的大小关系为 （ ）
B. 
C. 
D. 
