She is a(n) 1 girl.2 name is Lingling.She is a(n) 1 girl.2 name is Lingling.3 is thirteen years now.She's 4 No.10 Middle school.She is in 5 .She has a good friend at school.He's name is Jim.He is 6 American boy.7 eleven.He is in No.3 Middle school,8

She is a(n) 1 girl.2 name is Lingling.She is a(n) 1 girl.2 name is Lingling.3 is thirteen years now.She's 4 No.10 Middle school.She is in 5 .She has a good friend at school.He's name is Jim.He is 6 American boy.7 eleven.He is in No.3 Middle school,8
She is a(n) 1 girl.2 name is Lingling.
She is a(n) 1 girl.2 name is Lingling.3 is thirteen years now.She's 4 No.10 Middle school.She is in 5 .She has a good friend at school.He's name is Jim.He is 6 American boy.7 eleven.He is in No.3 Middle school,8 .Mrs Zhang is 9 English teacher.She is a 10 teacher
（ ）1.A Chinese B English C American D Japanese
（ ）2.A His B She's C He's D Her
（ ）3.A He B She C We D I
（ ）4.A on B / C a D in
（ ）5.A Class Two,grade one B Grade One,Class Two
C Class Two,Grade One D grade one,class two
（ ）6.A a B an C / D the
（ ）7.A His B Her C He's D She's
（ ）8.A too B and C teacher D student
（ ）9.A their B they C my D your
（ ）10.A very B very good C right D old

She is a(n) 1 girl.2 name is Lingling.She is a(n) 1 girl.2 name is Lingling.3 is thirteen years now.She's 4 No.10 Middle school.She is in 5 .She has a good friend at school.He's name is Jim.He is 6 American boy.7 eleven.He is in No.3 Middle school,8
She is a(n) 1 girl. 2 name is Lingling. 3 is thirteen years now. She's 4 No.10 Middle school. She is in 5 . She has a good friend at school. He's name is Jim. He is 6 American boy. 7 eleven. He is in No.3 Middle school, 8 . Mrs Zhang is 9 English teacher. She is a 10 teacher
（ A）1. A Chinese B English C American D Japanese
（D ）2. A His B She's C He's D Her
（B ）3. A He B She C We D I
（ D）4. A on B / C a D in
（ C）5. A Class Two, grade one B Grade One, Class Two
C Class Two, Grade One D grade one, class two
（ B）6. A a B an C / D the
（C ）7. A His B Her C He's D She's
（A ）8. A too B and C teacher D student
（A ）9. A their B they C my D your
（B ）10.A very B very good C right D old

1/3 = 1/（1*3） = 0.5* （1/1 - 1/3）
1/15 = 1/ （3*5） = 0.5 * （1/3 - 1/5）
……
加起来就是0.5*（1/1 - 1/3 + 1/3 - 1/5 + …… + 1/11 - 1/13） = 0.5 * （1 - 1/13） = 6/13

ADBDC BCAAC

ADBDCBCAAB,亲，把最佳答案给我吧！