东北地区是新中国工业的摇篮和重要的工农业生产基地。近年来，东北地区经济衰退，振兴东北老工业基地成为一个热门话题。据此回答19～21题。 19．
I think John will a good monitor, so I’d like to vote for him. A. turn B. change C. elect
Last week I ______ to Beihai Park with my classmates, and we had a good time. A. go B. went C. was
鼎湖山是我国建立的第一个国家级自然保护区，因其完整保存了具有400多年历史的地带性植被——南亚热带季风常绿阔叶林，被中外科学家誉为“北回
医院里检查患者是否患有糖尿病，是检测其尿液中的 A．脂肪 B．食盐 C．蛋白质 D．葡萄糖
给下列有机物按系统命名法命名：(1)______________________；(2) ___________；(3)___________；(4)_________________。
When you enter a supermarket, you see shelves full of food. You walk between the shelves. You carry a shopping basket and put your food in it. You probably hear soft, low music as you walk be
入口的米饭或馒头经过咀嚼后会变甜，这是哪一种物质被分解为麦芽糖的结果 A．蛋白质 B．脂肪 C．淀粉 D．无机盐
