阅读下列材料,从各题所给A、B、C、D四个选项中,选出一个最佳答案。

A

小题1: If you want to buy a little dog, you can call _______.

A. 555-5019   B 555-0001  C. 555-4140  D. 555-2732

小题2: If you tell the owner where Bluey is, you will be given____.

A．a gold medal

B．a large pet

C．a great prize

D．a lot of money小题3: Who has kittens of different colors on sale?

A．Tom

B．Sandy

C．Carl

D．Barbara小题4: Who is available to answer the phone 24 hours a day?

A．Barbara

B．Tom

C．Carl

D．Sandy小题5: The above four notices are all about _______.

A．dogs

B．cats

C．pets

D．selling pets

如图，有三个斜面1、2、3，斜面1与2底边相同，斜面2和3高度相同，同一物体与三个斜面的动摩擦因数相同，若物体分别沿三个斜面从顶端由静止下滑到底端时，三种情况下物体（　　）

A．损失的机械能△E₁=△E₂＞△E₃

B．到达斜面底端时的速度v₁＞v₂=v₃

C．到达斜面底端时重力的瞬时功率P₁＞P₂＞P₃

D．沿斜面运动的时间t₁＞t₂＞t₃