crp及腺苷酸环化酶基因突变的细菌都不能合成lac mRNA。 ( )
参考答案:对
按要求变化下列各句。
1. The boy usually has breakfast at seven o'clock. (对画线部分提问)
______ ______ the boy ______ breakfast?
2. Can your brother teach me English?(变为否定句)
Your brother _____ _____ me English.
3. We have a good time in the park.(变为同义句)
We ____ _____in the park.
4. Our English teacher usually reads English newspapers. (对画线部分提问)
_______ _______ your English teacher usually _______?
日神精神和酒神精神是()关系。
A、对立
B、互补
C、相互抵消
D、和谐