综合填空。

     A rich (有钱的) man wanted    1    (give) his mother a birthday present. "My present    2    (be) better

than (比……更好) any of my brothers", he    3    (think). He    4    (hear) about a bird. The bird    5    

(can)    6    (speak) five kinds of languages. He    7    (buy)the bird at once and sent it to his mother. It 

   8    (cost) him 1000 yuan. The day after her birthday, he    9    (call) his mother. "How do you like the

bird, mother?" he asked. His mother    10    (answer), "Delicious! "

1. _______ 2. _______ 3. _______ 4. _______ 5. _______

6. _______ 7. _______ 8. _______ 9. _______ 10. _______

液化天然气如接触人体会引起局部冻伤，主要原因在于：（）

A、液体自身温度较低

B、液体天然气气化瞬间吸收大量热量，造成周围环境变冷

C、液化天然气气化瞬间从人身体吸收大量热量

D、与放热、吸热无关