With the rapid development of China's social economy, new words are emerging endlessly. Neologisms are not only an important way for foreign students to understand Chinese society and culture, but also an important way for them to learn Chinese. Therefore, they should be seen as important content that cannot be ignored in Chinese teaching. Most middle and advanced-level students still keep a positive attitude towards the use of new words. They are eager to learn new words, but they often have problems using them. This paper will explain the necessity for foreign students to learn new words and the position and role of new words in teaching Chinese as a foreign language. Finally, it puts forward some suggestions for the selection and teaching methods of new words in Chinese teaching.

This study was performed to investigate the change of probing and feeding behavior of Q type of B. tabaci according to the decrease of residual effect of two insecticide, emamectin and pyridaben, using EPG technique. Examined the residual activity during 20 days, pyridaben is showed longer than emamectin benzoate. When treated two insecticides onto tomato leaves with the recommended concentration through 20 days, EPG waveforms of Q type of B. tabaci was recorded during three hours compare with the characteristic patterns of feeding behavior between two insecticides such as duration of first probing time, total duration of non-probing phase, total duration of probing phase and total duration of phloem phase. Recorded result from the change in total duration of probing activity to react the two insecticides, pyridaben was showed higher the time of probing activity, however, total duration of phloem phase was appeared low activity. Total duration of phloem phase with passage of days did not show until seven days, however, and gradually increased in emamectin benzoate after 10 days. In conclusion, residual effect between two insecticides was showed more rapidly decreased in emamectin benzoate, however, feeding behavior of Q type of B. tabaci was increased.