问题
多选题
下列哪些因素能够对种群的基因频率变化产生影响？[ ]
A．部分个体迁入迁出
B．自然选择
C．随机交配
D．没有突变
答案
AB
搜题请搜索小程序“爱下问搜题”
下列哪些因素能够对种群的基因频率变化产生影响？[ ]
A．部分个体迁入迁出
B．自然选择
C．随机交配
D．没有突变
AB
| 选择正确单词完成下列短文。 |
| I had a busy weekend (周末). On Saturday morning, I cleaned my room. In the afternoon, I 1 (do) my homework. It 2 (be) a little difficult. On Sunday morning, I 3 (go) to the library. I read a book about history. Then in the afternoon, I read a book and 4 (play) cards with my friends. On Sunday night, I 5 (watch) TV. I saw an interesting talk show (访谈节目). |
| ( ) 1. A. do ( ) 2. A. was ( ) 3. A. go ( ) 4. A. play ( ) 5. A. watched | B. does B. is B. went B. played B. watch | C. doing C. are C. goes C. playing C. watching | D. did D. am D. goed D. plays D. watches |