This article aims to expound that only by making use of the meaningful cultural content in the textbook, devising relevant and meaningful activities, and applying "Approximate Principle" in classroom teaching can we succeed in getting rid of traditional "teacher-centered" Intensive Reading teaching paradigm, rousing students interest, motivating students and cultivating their thinking abilities.

Variation characteristics and its mechanism of particulate heavy metals in coastal water over the course of tidal cycle on the eastern coast of Chongming Island in Yangtze Estuary were studied.

The usage of "close-set principle"in the design of college English;