Unit 1 Lesson 3 (略)
set off :出发（vi）;引起，引爆/引发（vt）
e.g.1. We'd better set off at 8 tomorrow morning.
2. A slight touch will set the bomb off.
3. Tom's speech set off a wave of anger.
set out 与 set off 用法相似时，意为"出发，动身"，另外，set out to do, set about doing 意
为"着手去做。。。。。"
Unit 1 Lesson 3
MADAME CURIE (2)
课文阅读理解检测题
! Radium may not do serious damage to ____.
A. people's health B. animal's life C. plants D. metal things
2. Which can be used to cure (治愈) human beings' disease?
A. Polonium B. Radium C. Uranium D. Silicon
3. The verb phrase "set off " in the text means to cause the bomb to ____.
A. start B. burst C. balance D. make
4. In which countries were two Radium Institutes set up?
A. Poland and America B. France and America
C. France and England D. Poland and France
5. Which characteristic(性格) belonged to Mrs. Curie?
A. Devotion B. Impatience C. Carelessness D. Selfishness
(Key1.D 2.B 3.B 4.d 5.A)
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