demonstration /ˌdemən'streɪʃn/有4个音节，包括一个重读音节和三个非重读音节。

This certificate is issued under the authority of the said Government，and it will remain in （） until Jan 1 2008. A: strength B: power C: force D: stre

-It’s dangerous to drive after drinking.-That’s true. It can increase the＿ of traffic accidents. A: advantage B: stre ss C: , safety D: risk