【判断题】正突变与反突变一般是不一样的。在多数情况下正突变率总是大于反突变率。
【单选题】Task 2 You will hear eight short conversations. After each conversation, you should decide on the best answer from the four choices marked A, B, C and D.
A.
Go to see the later show.
C.
Come back in ten minutes.
D.
Never go to the movies.
【单选题】“情境中蕴涵的问题对幼儿的认知或其他方面的发展是具有价值的”这是描述情境的哪个特性?
【单选题】Task 2 You will hear eight short conversations. After each conversation, you should decide on the best answer from the four choices marked A, B, C and D.
【判断题】基因突变是可逆的,多数情况下正突变率高于反突变率。
【单选题】Task 2 You will hear eight short conversations. After each conversation, you should decide on the best answer from the four choices marked A, B, C and D.