A lift is wonderful. It is really only a small room. Rooms usually stay in one place. Lifts travel up and down all day long.

Sometimes a worker stands in the lift. He or she operates(操作)it up and down. In modern lifts there is no worker. The people walk in. They know which floor they want. They push a button(按纽)and the lift goes to the floor. It is very fast and easy.

Lifts are very important for us. Why? Think about a tall building. Maybe it has twenty floors. Maybe it has fifty or more. Who can walk up all the stairs?   Perhaps people can climb them one time. Can someone climb thirty floors to an office everyday? Can small children walk up to their rooms on the twenty–forth floor？Can their mother and their father carry food up all those stairs? Of course not.

We can have high buildings because we have lifts. We could not have all the beautiful tall buildings in the world without lifts. They are really wonderful.

根据短文内容，判断正误。正确（T）,错误（F）.(10分)

小题1:The lift is a room’s name.

小题2:In modern lift there must be a worker operating it.

小题3:If you go into a modern lift, you can’t put any buttons.

小题4:A small children can go to the thirty floor of a building easily.

小题5:It is convenient(方便)to live in a tall building without a lift.

科学家们根据细胞代谢情况将细胞周期中的分裂间期分为G₁期(DNA合成前期)、S期(DNA合成期)、G₂期(DNA合成后期)。分裂期记作M期。下列A图为某生物体细胞有丝分裂某时期图；B图表示在一个细胞周期中细胞核内DNA含量的变化曲线；C图表示处于一个细胞周期中各个时期的细胞数目(用特殊方法在一个培养基中测得)。请据图作答：

(1)A图所示细胞中染色体、DNA、染色单体数目分别是_________、_________、_________。

(2)C图中的DNA含量为大于2C且小于4C的细胞处在B图的______期(填图中符号)。

(3)培养过程若用DNA合成抑制剂处理细胞，图C中DNA含量为2C的细胞数量会___________。