叶片之所以是光合作用的主要器官，是因为它有一系列的结构特点与光合作用相适应．下列图1为叶片的结构示意图，图2表示光照充足时叶肉细胞中叶绿体和线粒体内二氧化碳和氧气的来源或去路．据图回答：

在浓盐酸中H₃AsO₃与SnCl₂反应的离子方程式为：3SnCl₂＋12Cl^－＋2H₃AsO₃＋6H^＋=2As＋3SnCl＋6M，关于该反应的说法中正确的组合是     (　　)
①氧化剂是H₃AsO₃　②还原性：Cl^－>As　③每生成7.5 g As，还原剂失去的电子为0.3 mol　④M为OH^－　⑤SnCl是氧化产物

甘肃省的简称和行政中心是（　　）

宋应星的《____》，总结了____和____生产技术，强调____要和____协调发展。被称为“____”。

阅读题， 判断下列句子正误,。正确的写“T”,错误的写 “F”.

John: Excuse me, can I use your ruler, please?

Amy: Sure. Where is my ruler?

John: Is it in your book?

Amy: No, it isn't.

John: Is it under the desk?

Amy: No.

John: Is it on your bag?

Amy: Yes, Look! It's on my bag. Here you are!

John: Thank you.

①The ruler is John's. ____

②The ruler is in Amy's book.____

③The ruler isn't under the book.____

④John wants to use the ruler.____

⑤The ruler is on John's bag.____