平面直角坐标系xOy中，点A、B分别在函数y₁= $\frac{4}{x}$ （x＞0）与y₂=﹣ $\frac{4}{x}$ （x＜0）的图象上，A、B的横坐标分别为

a、b．

A: Hi, Mary! Did you watch TV last night?

B: ____ What happened?

A: A bus accidentl

B: ____

A: It happened in America!

B: Was it serious (严重的)?

A: ____ Many people died and a lot of people hurt themselves.

B: I' m sorry to hear that. ____?

A: Because the driver wasn't driving carefully.

B: ____?

A: He was talking on his mobile phone at that time.

B: That's new dangerous!

“挽黄河臂膀，依太行身躯，踏千里黄土，踩万年‘乌金’…”赞美的地区位于（　　）

变色龙善于随环境的变化随时改变自己的体色，既利于隐藏自己，又利于捕捉猎物。下列叙述错误的是（    ）