《饲料标签》标准适用于（）。A、商品饲料和饲料添加剂 B、自用饲料 C、可饲用原粮

     The United States has many different kinds of climate(气候) . On the west

coast (海岸) , the temperature changes very little between summer and winter,

but the north central states(中部各州) have a very different kind of climate. In

these states, people wear light clothes during the summer, and they need heavy

wool or fur clothes in winter.

      In the southwest, the climate is quite warm during the winter, but hot in

summer.

      In the eastern part of the United States, summer temperatures are very

different from winter temperatures. Summers are usually hot, and winters are

usually cold. Spring temperatures are comfortably warm, and autumn

temperatures are quite cool.

      Years ago, people  in  the  cold  areas (地区) of the United States did not

often get vegetables and fresh fruits during the winter. Today trucks and trains

carry fruits and vegetables very quickly to all parts of the United States. In this

way , American  " send their climates" to people in other states.

1.In the north central states people wear        clothes in summer and      clothes

during the winter.

A. silk ;linen                     

B. light; heavy fur

C. wool; cotton                  

D. wool; silk

2.The climate in the southwest is        during the winter , but        in  summer.

A. quite warm; little hot

B. quite cold; very hot

C. comfortably  warm ; rather hot

D. a little cold; rather hot

3.Today          parts of the United States can get fruits and vegetables in winter.

A. not all  

B. a few      

C. most      

D. all

4.Which statement is true according to the passage?

A. Most states in America have almost the same climate.

B. The climate in the east of the USA is almost the same as that in China.

C. Now Americans don't worry about eating fresh fruit and vegetables.

D. In winter, most Americans have to wear heavy clothes.

5.The best title (标题) of the passage should be        .

A. The Climate of the United States

B. Vegetables and Fruits

C. The Climate and Fruits

D. The United States

活性氧法

电力系统常见的调压措施有哪些？

曲轴与凸轮轴之间的传动方式有齿轮传动、（）、齿形带传动。