如图，质量为10kg的物体放在水平桌面上，求： （1）物体所受重力大小； （2

The Shanghai World Expo is intended to achieve our common goal,      world that is safer, cleaner and healthier than      one we’re living in.

A．the, the

B．a, /

C．a, the

D．the, /

己知圆O₁和圆O₂的半径都等于1，下列命题正确的是（    ）（把你认为正确的序号填上）。

①若O₁O₂=1，则圆O₁与圆O₂有两个公共点；②若O₁O₂=2，则圆O₁与圆O₂外切；③若O₁O₂≤3，则圆O₁与圆O₂必有公共点；④若O₁O₂>1，则圆O₁与圆O₂相交或外切。

—How long have you been working in this city?

—_______________.

A. Five years ago.          

B. Since last year.            

C. After I left university.

用所给词的适当形式填空 。

小题1:Will you invite the exchange students          (take) part in the activity?

小题2:The doctor can make Neil            (feel) better than before.

小题3:Our paintings are quite different from              (they).

小题4:Read more, and you            (be) better at English.

小题5:Look ! Simon            (fix) the broken bike for his classmate.

计算机的存储系统通常包括

A．内存储器和外存储器

B．软盘和硬盘

C．ROM和RAM

D．内存和硬盘