图示基因对酶合成调节中的“诱导”情况。
参考答案：
以乳糖操纵子为例：
— It’s such a pity. I didn’t get the first place in the exam.
— Come on. __________
A．Nobody is perfect.
B．Congratulations!
C．Lucky you!
D．You really did badly
求未知数x．
x-1.5=1.24；
4.52+x=5．
