【判断题】寄生是指一个种(寄生物)寄居于另一个种(寄主)的体表或体内,靠寄主体液、组织或已消化物质获取营养而生存。
【判断题】对切割工具具有污染作用的物质是糖分、盐渍和黏粘物。
【单选题】Jane, I would like to meet on Tuesday, but if my plane is delayed I will see you at Friday's meeting. John
A.
John has to postpone his meeting until Friday.
B.
John will be late for his meeting on Tuesday.
C.
John hopes to see Jane on Tuesday.
【单选题】按照罗斯托的经济增长阶段理论,从传统社会向现代社会过渡最关键也是最困难的阶段是
【判断题】对切割工具具有污染作用的物质是糖分、盐渍和黏粘物。A. 对 B. 错