某同学在做单臂俯卧撑运动，如图所示．他的重心在A点，所受重力为520N，他将身体

在相同条件下，两种物质的量相同的气体必然（    ）

A．具有相同的体积

B．体积均为22.4L

C．具有相同的原子数目

D．具有相同的质量

下列各项中不符合成人特发性血小板减少性紫癜特征的是（）

A.紫癜多出现于四肢

B.女性可以仅表现为月经过多

C.脾大，多超过肋下5cm

D.口腔黏膜血疱

E.牙龈出血

地质雷达天线要求具有屏蔽功能，最大探测深度大于2m，垂直分辨率应高于( )mm。

A．5
B．10
C．20
D．50

Honeybees

Honeybees can do three kinds of jobs.

It is one of the most unusual insects in the world. Bees are special because they divide up their honeybee work. Each bee has a certain job to do.

The busiest bee is the worker. Workers build the nest, called a hive. Inside the hive, workers make a honeycomb from wax(蜂蜡). They store honey there for food. Workers are always cleaning and fixing the hive. They even stand at the opening and fan their wings to cool the hive. Worker bees will attack anything—even people—to keep their hive safe.

Another kind of bee is the drone(雄蜂). Drones are male bees, and their job is to fly with the queen bee and mate with her. After the queen mates, the worker bees drive the drones away. The drones then starve to death.

The third kind of bee is the queen. Each hive needs only one queen, and her job is laying eggs. She can lay as many as 2, 000 eggs a day.

小题1:The bee’s nest is called a _______.    

A．hive

B．honeycomb

C．drone

D．wax小题2:Which jobs do workers do?

A．They lay 2, 000 eggs each day and build a nest.

B．They mate with the queen bee and then starve.

C．They clean the hive and keep it cool.

D．They attack the queen bee.小题3:According to the story, bees _______.  

A．are very dangerous insects

B．will attack anything or anyone to protect the hive, if necessary

C．are like any other insect that flies

D．eat each other as food小题4:The drone is driven away when its job is finished, because _______.  

A．it attacked the workers

B．it is no longer needed in the hive

C．the queen bee has died

D．it ate the queen bee

省级食品药品监督管理局制定的标准是（）

A．中国药典

B．企业标准

C．注册标准

D．行业标准

E．炮制标准