_________ Henry's mother ________ his father speaks English. They both speak Chinese.
A:Either; or
B:Neither; nor
C:Both; and
D:Not only; but also
4997,4998,4999,____,____,____.
小莉身高1.5m,站在平面镜前4m处,她的像到镜面的距离为____m, 像高____m;若将一块和平面镜一样大的木板放在镜子后1m处如图所示,这时她____(填“能”或“不能”)在镜中看到自己的像。若她以0.5m/s的速度向平面镜靠近,则镜中像的大小变化是____。