1. (2022九上·江都月考) 阅读下面短文，从各题所给的 A、B、C、D 四个选项中选出最佳选项。

Global Study of Teens

Recently, Organization for Economic Co-operation and Development (OECD) studied 600,000 15-year-olds around the world. Let's look at the result.

1. （1） The OECD study is about ________.

   A . Teenagers B . Boys C . Girls D . Children
3. （2） —How many students are always unhappy with their lives according to the recent study?

   —________.

   A . 36,000 B . 24,000 C . 30,000 D . 12,000
5. （3） This study may be taken from ________.

   A . a book review B . a travel guide C . a medicine instruction D . a research paper