—Have you known Dr. Jackson for a long time? —Yes, since she ________the Chinese Society. A. has joined B. joins C. had joined D. joined
设全集是实数集，M={| }，N＝{x|}，则图中阴影部分表示的集合是 A. B. C. D.
Perhaps it is true that nobody in the world knows exactly how the earth __________. A. came up B. came out C. came to power D. came into being
―????????When do we need to pay the balance ? ― September 30. A. In B. By C. During D. Within
推动第二次工业革命兴起的政治前提是 A. 资本主义制度在世界范围内确立 B. 科学技术的重大突破 C. 资本主义列强全球扩张积累大量资本
取少量无机盐溶液试样对其中的离子进行检验。下列判断正确的是 （ ） A．加入盐酸，产生白色沉淀，则试样中一定有Ag+ B．加入
我国渤海、黄海、东海、南海海水含有不少化学元素，其中铝、锰元素总量均约为吨．用科学记数法表示铝、锰元素总量的和，接近值是（ ）． A
古诗文填空。（8分）⑴ ▲ ，悠然见南山。（陶渊明《饮酒》）⑵枯藤老树昏鸦， ▲ ，古道西风瘦马。（马致远《天净沙·秋思》
