81.The work of engineer requires ______________(智力) plus experience. 82. _______ (下定决心) to finish our work ahead of schedule, we worked day and night. 83. The car is becoming a popul
现在人们普遍认为人类的始祖在（ ） A．欧洲 B．亚洲 C．非洲 D．
—Do you have any problems if you ________ this job? —Well，I'm thinking about the working day. A．offer B．will offer C．are offered D．will be offered
________ of the truth of the news, he told his colleagues and friends about it. A．Convincing B．Convinced C．To convince D．Having convinced
It is believed that if a book is ______, it will surely ______ the reader. A. interested; interest B. interesting; be interested C. interested; be interesting
下列化学电池不易造成环境污染的是（ ） A. 锂电池 B. 锌锰电池 C. 镍镉电池 D.
1768年拉瓦锡对当时人们认为水能变成土的观念发出挑战．他将一定量的蒸馏水加入蒸馏器中，反复加热101天，发现蒸馏器中产生少量沉淀，称得整个蒸
