自然保护区可以分为（）。A．核心区 B．控制区 C．缓冲区 D．保护区 E．试验区

After staying several hours with her 10-year-old daughter who is admitted to the hospital with an asthmatic attack, the mother leaves to attend to her other children. The child exhibits continued signs and symptoms of respiratory distress. Which of the following findings would lead the nurse to make a nursing diagnosis of Anxiety related to respiratory distress

A. Complaints of an inability to get comfortable.
B. Frequently requests for someone to stay in the room.
C. Inability to remember his exact address.
D. Verbalization of a feeling of tightness in his chest.

假定经济实现充分就业（总供给曲线是垂直线），则总需求增加将：

A．提高价格水平和实际产出

B．提高价格水平但不影响实际产出

C．提高实际产出但不影响价格

D．对价格水平和产出均无影响

下列有关CO₂和CO的知识归纳中，不正确的是（　　）

A．它们的组成相同

B．都不能供给呼吸

C．它们的化学性质相似

D．CO可作燃料，CO₂不能

A～H是初中化学常见的物质，其中E为黑色固体，H为蓝色沉淀，这些物质的相互转化关系如图所示，其中部分生成物和反应条件已省略．

（1）写出下列物质的化学式：A　         　，G　        　，H　                　．

（2）化学反应常伴有能量变化，物质B与水反应时会　        　（“吸收”或“放出”）热量．

（3）写出D→F的化学方程式：　                        　．

（4）写出E→C的化学方程式：　                                  ．

简述人体运动系统的组成及功能