固需寄生虫
参考答案：
指完全领带寄生生活不能脱离宿主而自下而上的寄生虫。
Read and choose. (把下列月份划分到合适的季节)
February May June January March April
September July October December August November
1. Spring _____ _____ _____
2. Summer _____ _____ _____
3. Fall _____ _____ _____
4. Winter _____ _____ _____
线路图
