种群环境的容量决定于( )。
A.温度、光、水、营养、空间
B.非生物环境、生物特性、遗传特性
C.食性、行为、适应能力
D.温度、光、水、行为、适应能力
参考答案:B
阅读短文,判断正(T)误(F)。
My best friend is Ann. She is a girl. She has curly hair. She is from America. She has a yellow schoolbag.
What's in it? Two English books, three story-books and a math book. She likes English very much. She likes
music, too.
( ) 1. Ann has curly hair.
( ) 2. Ann has a red schoolbag.
( ) 3. There are ten English books in her schoolbag.
( ) 4. Ann likes music.
( ) 5. Ann is from Canada.
可引起疾病暴发的是
A.接触传播B.诊疗手术传播C.水和食物传播D.各种制剂传播E.虫媒传播