【单选题】According to the professor, why is chemistry sometimes called the central science?
A.
Chemistry courses are the most difficult.
B.
Chemical processes occur all around us.
C.
Chemistry students have high status.
D.
Chemists study how to control diseases.
【单选题】The meeting held in our classroom yesterday _____ two hours. [ ]
【单选题】Our research has focused on a drug which is so ______ as to be able to change brain chemistry.
【判断题】大脑皮质建立的运动动力定型越巩固,学新技术就越易受干扰,不容易形成
【判断题】从运动和构造的角度来看,机器和机构是不一样的。