2．下列各组词语中，没有错别字的一项是（ ） A．幽僻 寂莫 没精打采 责无旁贷 B．勖勉 袅娜 揠苗助长 婆娑起舞 C．切蹉 弭谤 孜孜
根据下列装置，结合所给化学知识回答下列问题。 (1)请写出图中标号仪器的名称：① ▲ ；② ▲ 。 (2)实验室制取少量二氧化碳时
AIDS is said____the number one killer of both men and women over the past few years in that poor area, where no medical services are available. A．to be B．to have been C．bei
Long, long ago there was a wise man that used to go to the sea to do his writing. He had a habit of walking on the beach before he began his work. One day he was walking along the shore. As he look
—David，the windows of the room are very dirty.________ I clean them before we move in? —Of course. A．Will B．Would C．Shall D．Do
“稻花香里说丰年，听取蛙声一片”。“水稻”和“青蛙”在农田生态系统中分别扮演什么角色？ A.生产者、生产者 B.消费者、生产者
下列操作不能用来淡化海水的是( ) A．过滤 B．使海水结冰脱盐 C．加热蒸馏 D．多级闪急蒸馏
19世纪中期后，推动资产阶级革命和改革成为时代潮流的根本因素是 A．西欧资本主义萌芽的出现 B．工
。