動詞用單數形式

A phrase of measurement usually takes a singular verb.

Ten miles is too far to walk.
One hundred dollars is a reasonable price.
Three months is a long time for me.

Here, we are talking about a distance of ten miles, a sum of one hundred dollars and a length of time, not individual miles, dollars or months.

Titles and names take a singular verb when they refer to one thing.
“Star Wars” was a successful film.
Charles Dickens is my favourite author.
The United States is a powerful country.

Some nouns end in –s, but singular in meaning.
Physics is my favourite subject.
News of a serious road accident is just coming in.