如图，一质量为m的滑块静止置于倾角为30°的粗糙斜面上，一根轻弹簧一端固定在竖直墙上的P点，另一端系在滑块上，弹簧与斜面垂直，则（   ）

Dear John,

    How are you? Nice1 you. From your letter I know a lot about you and your school. Now let me2 something about me and my school.

    I am thirteen years old. I am 3 Class Two, Grade One. My father is a teacher. He is my 4English teacher. My mother is a doctor. I have a sister.5 are in the same school. We can sing(唱) many songs6 English.

    This is my classroom.7have a class photo on the wall. But can you see 8photo? It's at the door. In the classroom 9 our desks and chairs. Mrs. Green is our head teacher.10 is very kind(友好).

    Please come and have a look at our school if you are free.

Millie

下图所示的欧元是由当今世界上最大的经济体所发行的货币，这一世界上最大的经济体就是由西欧国家成立的（   ）