Henry will give us a report as soon as he ___________．
A：arrives
B：arrived
C：is arriving
D：will arrive
自“贝尔福宣言”发表以来，中东地区阿以冲突就不时发生，那么导致中东地区动荡不安的关键是
80÷4=____ 60÷3=____ 74－8=____ 33×2=____ 76－50=____
关于电磁波和能源，下列错误的是（ ）
