读短文，判断句子正(T)误(F)。

      I'm John. This is my family. There are four people in my family. What are they doing? I'm doing my

homework. My mother is washing clothes. My father is talking on the telephone. Where is my sister? Oh,

she's listening to the radio in her bedroom.

( ) 1. There are five people in John's family.

( ) 2. John is doing his homework.

( ) 3. His father is watching TV.

( ) 4. His mother is washing clothes.

( ) 5. John's sister isn't at home.

现用98%的浓H₂SO₄（密度为1.84g/cm³）来配制500mL0.2mol/L的稀H₂SO₄．请回答下列问题：

（1）经计算，需浓H₂SO₄的体积为______mL．（保留一位小数）

（2）现给出下列仪器（配制过程中可能用到）：①100mL量筒 ②10mL量筒 ③250mL烧杯  ④托盘天平 ⑤500mL容量瓶 ⑥胶头滴管 ⑦玻璃棒

按正确操作必需使用仪器的先后顺序排列正确的是______

A．④③⑦⑤⑥B．②⑤⑦⑥C．①③⑤⑥⑦D．②⑥③⑦⑤⑥

（3）写出浓硫酸稀释操作的要点______

（4）对所配制的稀H₂SO₄进行测定，发现浓度大于0.2mol/L．请你分析下列哪些操作会引起所配浓度偏大（填写字母）______．

A．用量筒量取浓硫酸时，仰视量筒的刻度

B．容量瓶未干燥即用来配制溶液

C．浓硫酸在烧杯中稀释后，未冷却就立即转移到容量瓶中，并进行定容；

D．往容量瓶转移时，有少量液体溅出

E．烧杯未进行洗涤

F．在容量瓶中定容时俯视容量瓶刻度线

G．定容后塞上瓶塞反复摇匀，静置后，液面不到刻度线，再加水至刻度线．