WHICH SENTENCE GIVES THE MAIN IDEA OF THE PASSAGE

Câu 49:

Which sentence gives the main idea of the passage?

A.

Because we take so many tests, we learn test-taking techniques that help us perform better.

B.

However, in recent years, IQ test scores in some countries have begun to decline.

C.

This trend of improving scores is known as ‘”the Flynn effect,” and scientists want to know what is

behind it.

D.

Lifestyle changes that come with modem technology may also have a negative effect on intelligence.