考博习题练习
| 考博易错题（2018/6/15） |
第1题： 
|
| 【单选题】： |
| 第2题： Hydrocarbons, ______ by engine exhausts, react with nitrogen oxides in the presence of sunlight to form complex toxic gases. A．are given off B．give off C．they are given off D．given off |
| 【单选题】： |
| 第3题： Telecommuting is a new form of work ______to work, such as fathers with children, the chance to work while remaining at home. A．that affording those unable previously B．affords those who were previously unable C．affording those previously unable D．afforded those previously unable |
| 【单选题】： |
| 第4题： What does the passage mainly discuss A．How parasites reproduce. B．How organisms react to invaders. C．How antibiotics work to cure disease. D．How the immune system of vertebrates developed. |
| 【单选题】： |
| 第5题：The criminal's ______ for leniency was ignored by the jurors.
A．protest B．demand C．plea D．defence |
| 【单选题】： |