有一些数在450与560之间,其中最接近500的两个整十数是____和____ 。
- Do you know Victory Day in China?
- Yes, it's _______ September 3rd _______ each year. It tells the world that Chinese people love peace and hate wars. Chinese people will never forget the history.
当水星运行至地球和太阳之间,如果三者能够连成直线,便会产生水星凌日现象.如图能反映水星凌日,水星、地球和太阳三者位置关系的示意图是( )
73-67=____
90-88=____
We are planning to have a surprise party ________ her fifteenth birthday