2 Choose the word that is different in type from the others.(选出不同类型的单词)
() (1) A. warning B. caution C. danger D. playground
() (2) A. safety B. security C. equipment D. danger
() (3) A. slide B. warning C. seesaw D. swing

(1) D (2) C (3) B

3 Choose the best answer.(选择最恰当的答案)
() (1) We should always check the safety of the before using it.
A. playground
B. gym equipment
C. swimming pool
D. all of the above
() (2) If you see a warning sign, you should .
A. ignore it
B. read it carefully
C. remove it
D. tell others
() (3) In case of an emergency in a public building, you should look for the .
A. elevator
B. emergency exit
C. playground
D. gym

(1) D (2) B (3) B