一、完形填空　　It was the old lady’s birthday. She got up early to be ready for the post. From the second floor flat s......

The tea geometrid Ectropis obliqua is one of the most serious leaf-feeding insect pests in tea(Camellia sinensis) in Eas......

Perinatal transmission of Human immunodeficiency virus(HIV),also called mother-to-child transmission(MTCT),accounts for ......

为研究小兴安岭阔叶红松林蛾类群落组成结构及季节动态，2013年和2014年6—9月份，通过灯诱法对阔叶红松林蛾类群落进行系统的调查。共......