拉萨有“日光城”之称,日照时间约占全年总时数的三分之一,这是因为()
He_____(have)gotaskippingrope.
()1.Couldyouhelpme,please?A.OK.
()2.Thanksalot.B.You'rewelcome.
()3.Let'sputthebooksinthebox.C.It'sMonday.
()4.Canyoucarryit?D.No,it'sfull.
()5.Who'sondutytoday?E.lam.
()6.Isitempty?F.No,it'slight.
()7.Whatdayisittoday?G.Certainly.
()8.Isthatbagheavy?H.No.LiLeiisn'there..
()9.Areweallheretoday?I.No,thanks.
()10.Letmehelpyou.J.Yes,Ican.
()TheboysarefromTokyo.Theyare______.
X、Y、Z、M、N五种常见的短周期元素原子半径随原子序数变化如下图。已知X的一种原子的质量数为18,中子数为10;Y和Ne原子的核外电子数相差1;M的单质是一种常见的半导体材料:N的原子半径在同周期主族元素中最小;Y、Z、N三种元素的最高氧化物对应的水化物两两之间可以发生反应。下列说错误的是()