A：Great changes have been taken place
B：What great change
C：How it has changed
D：How great it has changed
设某数为x，根据下列条件列出方程：
（1）某数的12比它的3倍少7． ____
（2）某数比它的2倍多1．____
（3）某数的3倍与2的和是它的一半． ____
（4）某数的35与6的差的绝对值是12．____．
下列有关生物体结构层次的说法，正确的是（ ）
Hello!My name is Bob. My classroom is not big but nice. There are 21 desks and 20 chairs. 墙上有一些画和一幅地图。Mrs Brown is our English teacher. She is from a big city.She is nice. Her husband Mr Brown is a teacher too, but he isn't in our school. Tom is my good friend. We like playing football on Saturday. Where is my football? It is under my desk.
