如图所示的四种电器中,利用电流热效应工作的是
答案:A
电熨斗利用的是电流的热效应,A正确;电风扇和电冰箱利用的是电流的机械效应,电视机利用的是电流的磁效应,BCD错误。
阅读短文,然后回答问题。
Mr. Read (里德) is a doctor (大夫). Mrs. Read is a teacher. They have a son and a daughter (女儿).
They are Jim and Kate. Jim is ten years old. Kate is eight years old. Jim is Kate's brother. Kate is Jim's sister.
They are good students.
1. Who is Kate's mum?
2. Who is Jim's dad?
3. Is Mrs. Read a teacher?
4. Is Mr. Read a teacher, too?
5. Who's Kate's brother?
6. Are Jim and Kate good students?
Is there anyone in your class who__________the car accident that happened in front of our school this
morning? [ ]
A. witnessed
B. observed
C. introduced
D. predicted