Saroo experiences the three stages below in the text. Put the events in each stage in order.2.A Hard Life

Saroo experiences the three stages below in the text. Put the events in each stage in order.3.The Way Back Home

Complete the interesting facts with words from the boxes.beggar’s adoptedchildhood memories1 A woman accidentally (意外地) dropped her ring in a(n) ________ cup. When he gave it back, people online gave him over $100, 000 as a reward.2 Very few people have any ____________ from under the age of 4.3 Twins ____________ to different families met by chance (偶然) later at university.4 The most common ____________ memory is a trip to the dentist(牙医).

配制Na2S2O3溶液时必须用（）。

A.纯净水
B.煮沸冷却的蒸馏水
C.酸性水
D.中性水

下列物质能直接配制标准溶液的是（）。

A.Na2S2O3
B.K2Cr2O7
C. ub> HCl
D.NaOH

可以作为基准物质的是()。

A.H2SO4
B.NaOH
C.Na2C2O4
D. KMnO4

下列哪种物质可受水中微生物作用而分解（）。

A.I2
B. KMnO4
C. Na2S2O3
D. NaOH

配制Na2S2O3溶液时待完全溶解后必须加少量（）。

A.Na2C2O4
B. Na2CO3
C. 邻苯二甲酸氢钾
D. HCl

系统中担负（ ）、（ ）和（ ）电能任务的电路称为主电路，也就是一次电路。

A. 输送
B. 变换
C. 控制
D. 分配

用来（ ）、（ ）、（ ）和（ ）主电路及其主电 路中设备运行的电路称为二次电路。

A. 输送
B. 控制
C. 指示
D. 保护