英语升降调是指声音大小吗?

不是

英语的语调分成四个音阶：低音区、中音区、高音区、特高音区。语调是达意的，它表达句子的某种意义。
中调和高调是最普遍的模式，中调表示中等声音，既不高也不低，称为平调；高调表示比中调高一级的声调，句子中的实词往往用高音区，所谓实词，在句子中扮演十分重要的角色，因为它们要负责说明整个句子所要说明的东西。如果结束一个句子，可以用低音调来结尾，如果表达强烈的情绪，强调某些东西，可以用特高音调。
一、降调，用于陈述句，特殊疑问句。
I like to eat strawberries.
He is a police officer.
My mother's birthday was yesterday.
Her family plan to travel to Italy.
We will go to the basketball game.
Where does Nick come from?
Who is your favorite singer?
What's your name?
How do you go to school?
When does the movie start?
二、升调：
用于一般疑问句，列举事物时。
Do you like reading novels?
Will you join Tim's birthday party?
Are you kidding?
Does your dad go to work every day?
Would you mind my opening the window?
Richard goes swimming, jogging and hiking every weekend.
Mom buys vegetables, fruit and snacks for us.
Which color do you like, blue or purple?
Are you fond of pandas or koalas?
希望我能帮助你解疑释惑。