A:雄性个体的基因型可能是XBY,XbY
B:雌性个体的基因型可能是XBXB,XBXb,XbXb
C:若后代全为宽叶雄株个体,则亲本基因型为XBXB和XbY
D:若后代性别比为1:1,宽叶个体占 34 ,则亲本基因型是XBXb和XBY
①用于测量液体体积的仪器是____;
②用于取用固体粉末的仪器是____;
③用于少量试剂的反应容器是____;
④用于加热其他装置的仪器是____.
已知函数f(x)=ln(x+x2+1),若实数a,b满足f(a)+f(b-2)=0,则a+b= ( )
389×2=____ 812÷4=____
A. What did you do there?
B. What about you?
C. Where did you go yesterday?
D. Did you read storybooks?
Tina: Hello, Tony. ____
Tony: I went to the library.
Tina: ____
Tony: I read some interesting books. ____
Tina: I went to the zoo and saw many animals.