Objective To investigate the status of schistosome infection and reinfection in different stages in main infection season among residents in heavy epidemic areas in Yunnan Province and to provide evidence for making more effective measures of schistosomiasis control.

Based on current culture teaching in FLT, this paper proposes a teacher should act as different roles at different stages of classroom culture teaching and learning from the perspective of learning, so to enhance the effect of culture teaching.

Although some analyses have been conducted on collocation errors, there are few researches on comparative analyses of collocation errors committed by Chinese English learners at different stages of English learning.

Soil nutrient changes of Seriphidium transillense desert grassland under different degraded degrees;