The door opened and my mother came in ______ a handbag in her hand.
A：on
B：in
C：at
D：with
不改变分式的值，把下列各式的分子、分母中的各项系数都化为整数，且使分子和分母不含公因式．
（1）12a+13b23a-14b；（2）45x+0.25y12x-0.6y．
Do your brother make travel plans on the computer?____
写出近义词。
瞬间____ 疯狂____ 危急____
