下列生物中不具有细胞结构的是（ ） A．鼠妇 B．桃树 C．香菇 D．禽流感病毒

They all thought________ necessary________ you to buy some bread and soft drinks．

A．that；for

B．it’s；for

C．it；for

D．that was；of

- Doctor, how are the twins going?

- Don't worry. _______of them needs_______.

A．Neither; to be operated

B．Either; being operated

C．None; to be operated on

D．Neither; operating on

（）给人以向上升腾的感觉，使空间的伸展感增强。

A．垂直线

B．水平线

C．曲线

D．斜线

某厂一年共浇钢10010炉，漏钢10炉，求漏钢率是多少？

货物的活性指数越大，就越容易装卸搬运。