There is a 20-metre-long swimming pool there.The swimming pool is ()()()

There is a 20-metre-long swimming pool there.The swimming pool is ()()() THERE IS A FIRST HUNDRED METRE RACE[改错] There is _____ 800-metre-long. 应用a 还是an ? 1、There is a big tree behind my house .It is about _____.A .20 metre high B .high 20 metre C.high20metres D.20 metres high______解析：____________________________________________________2、I like sking better than climbing because Ithink climbi There is also a 50-metre-long swiming pool 同义句 There is a ___river A.6000-metre-long B.6000 metre long C.6000-metres-long D.6000-metres long在解释一下.谢谢! There is also a 50-metre-long swimming pool 同义句=The swimming pool is ( ) ( ）（） This river is---A 100 metre long B100- metre-long B 100 metre'long D 100 metres long The swimming pool is about( )and there is also an( )playground.A.fifty metres long;eighty-metre-long B.fifty metres long;eighty metres long C.fifty-metres-long;eighty-metre-long D.fifty metres long;eighty-metres long ( ) There is ____________ tree in our school .A.a 8-metres-tall B.an 8-metre-tall C.an 8 metre tall 我知道是选B,可是请高人指点,为什么选B呢? there is ( ) building in the cityA 80 metres tallB an 80-metres-tallC 80 metre tallD an 80-metre-tall （ ）The swimming pool about _and there is also a _ playground.A fifty metres long ；eight—metre—longB fifty metres long；eight metres longC fifty—metre—long；eighty—metre—longD fifty metres long；eighty metres long How deep is the well?A..4 metres deep B.4 metre deep c.four-metre deep d.four-metre-deep到底选哪个?感激不尽! 知道的请帮忙,The rive is more than ___.A.twenty metre wide B.twenty metres wide C.twenty metre of wide D.wide of twenty metre He is first in the _______race A.two-hundred-metres B.two-hundred-metre C.two hundred metre The lake near our school is ____.A.50 metres' deepB.50-metre deepC.50 metres deepD.50-metre-deep The bridge is ( ).A.100 metres long B.100 metre long C.100--metre long 为什么?C为什么错 how beautiful the____________building is!A.369 metres tall B.369 metre tallC.369--metres--tall D.369--metre--tall