A blue whale can be more than thirty metres long and weighs over 150 tons.为什么要加be?

How long can a blue whale be?急!快!翻译及回答!大约30metres long A blue whale can be more than thirty metres long and weighs over 150 tons.为什么要加be? the biggest whale is the blue whale.或the biggest whale is a blue whale.那个表达正确? （a blue whale） is the biggest whale（）中为什么不能这样表示?不是有a horse can .（a blue whale） is the biggest whale（）中为什么不能这样表示?不是有a horse can run fast.a+单数名词也可表示一类吗? 1.Is an elephant much smaller than a blue whale?2.Which fish can swim faster than most boats? The biggest whale is( )blue wale.A.the B.a Which is smaller,a blue whale or an elephant? The biggest whale is ________ blue whale,which grows to be about 29 meters long—the height of ________9­story building.A．the；the B．a；aC．a；the D．the；a The biggest whale is the blue whale.可以替换成The biggest whale is a blue whale 为什么可以的话 ,当a 和the都表示一类人或事物的时候的区别. When a whale sings,people can s_______hear the sound. is an elephant much smller than a blue whale的意思 回答这个句子:Is an elephant much smallre than a blue whale? A fully-grown blue whale _____110 feet in length and ____several tons 英语选折1 () The biggest whale is blue whale,which grows to be about 29 meters long — the height of 9-story building.A． the ; the B． a ; a C． a ; the D． the ; a 2 () – Hello,could I speak to Mr.Smith?– Sorry,wrong number.There isn't 英语选折() The biggest whale is blue whale,which grows to be about 29 meters long — the height of 9-story building.A． the ; the B． a ; a C． a ; the D． the ; a 2 () – Hello,could I speak to Mr.Smith?– Sorry,wrong number.There isn't M blue whale前为什么用the I am the biggest blue whale 1 The biggest whale is the blue whale,which grows to be .Alexander G.Bell invented the telephone in 1976.这两句中THE表示类指,我觉得THE 改成 A 也可以,2 the rich are/is the rich 是复数概念吗?3 Why is the town just like this,this s