下图示意某湖7000年来的湖面变迁状况，该湖多年平均降水量约为95mm，蒸发量约为1315mm。读图，该湖泊变迁最快的时期是（    ）

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

（2015•嘉兴）数学活动课上，四位同学围绕作图问题：“如图，已知直线l和l外一点P，用直尺和圆规作直线PQ，使PQ⊥l于点Q．”分别作出了下列四个图形．其中作法错误的是（　　）