2.某社区为了响应国家节约用电的号召，将所有用户家中的灯泡全部换为节能灯。若全部用户家中一共有1000个灯泡，换成节能灯后每天节约256千瓦时的电，则平均每个节能灯每天节约多少千瓦时的电？

0.256千瓦时。

三、阅读 Amy 和社区朋友 Jack 关于时间管理的邮件，选择正确的答案。
Dear Jack，
My name is Amy. I'm in Beijing. It's 4:00 p. m. now. It's time to do sports with my friends. I can't be late. In China, people like to be on time. People often say "I'm sorry." when they are late.
Your friend，
Amy
Dear Amy，
Hi, I'm Jack. I live in Spain(西班牙). It's 10:00 a. m. It's time to go to my friend's party. My friend's party is at 10:00 a. m. We can come at 10:30 a. m. or 11:00. Why? In Spain, we are very relaxed (不拘束的). We don't say "Hurry up!" to friends.
Your friend，
Jack
()1. It's in Beijing.
A. 4:00 a. m.
B. 10:00 a. m.
C. 4:00 p. m.
()2. It's time for Amy to .
A. do sports
B. have PE class
C. go to the party
()3. What does "on time" mean(意思)?
A. 超时
B. 按时
C. 随时
()4. Where is Jack?
A. In Australia.
B. In the USA.
C. In Spain.

1.C 2.A 3.B 4.C