题目内容
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A thin rod is uniformly charged (Q, L). How much is the electric potential for point P in the figure？
A、
B、
C、
D、
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A thin rod is uniformly charged (Q, L). How much is the electric potential for point P in the figure？ (3 significant numbers)
A、
B、
C、
D、
Primitive men who lived in hot regions could depend on the heat of the sun【8】their food. For example, in the desert【9】of the southwestern. United States, the Indians cooked their food by【10】it on a flat【11】in the hot sun. They cooked piece of meat and thin cakes of com meal in this【12】. We surmise that the earliest kitchen【13】was stick【14】which a piece of meat could be attached and held over a fire. Later this stick was【15】by an iron rod or spit which could be turned frequently to cook the meat【16】all sides.
Cooking food in water was【17】before man learned to make water containers that could not be【18】by fire. The【19】cooking pots were reed or grass baskets in which soups, and stews could be cooked. As early as 166 B. C, the Egyptians had learned to make【20】permanent cooking pots out of sand stone. Many years later, the Eskimos learned to make similar pans.
(1)
A．in
B．on
C．through
D．for
Primitive men who lived in hot regions could depend on the heat of the sun【48】their food. For example, in the desert【49】of the southwestern United States, the Indians cooked their food by【50】it on a flat【51】in the hot sun. They cooked piece of meat and thin cakes of corn meal in this【52】. We surmise that the earliest kitchen【53】was a stick【54】which a piece of meat could be attached and held over a fire. Later this stick was【55】by an iron rod or spit which could be turned frequently to cook the meat【56】all sides.
Cooking food in water was【57】before man teamed to make water containers that could not be【58】by fire.
The【59】cooking pots were reed or grass baskets in which soups and stews could be cooked. As early as 166 B. C., the Egyptians had learned to make【60】. permanent cooking pots out of sand stone. Many years later, the Eskimos learned to make similar pans.
(41)
A．in
B．on
C．through
D．for
Primitive men who lived in hot 【C8】______ could depend on the heat of the sun to cook their food. For example, in the desert areas of the southwestern United States, the Indians cooked their food by placing it on a flat 【C9】______ in the hot sun. They cooked pieces of meat and thin cakes of corn meal in this 【C10】______ We guess that the earliest kitchen 【C11】______ was a stick 【C12】______ which a piece of meat could be attached and held over a fire. Later this stick was 【C13】______ by an iron rod which could be turned frequently to cook the meat 【C14】______ all sides.
Cooking food in water was 【C15】______ before man learned to make water containers that could not be 【C16】______ by fire. The 【C17】______ cooking pots were reed or grass baskets in which soups and stews could be cooked. 【C18】______ 166 B. C. the Egyptians had learned to make mere 【C19】______ cooking pots out of sandstone. Many years later, the Eskimos learned to make 【C20】______ pans.
【C1】
A．thus
B．however
C．otherwise
D．consequently
On Halloween, children dress themselves in various () to go to parties.
A、clothes
B、uniform
C、shirts
D、costume
Early people who lived in hot regions could depend on the heat of the sun to cook food. For example, in the desert areas of the southwestern United States, the Indians cooked their food by placing it on a flat stone in the hot sun. They cooked pieces of meat and thin cakes of corn meal in this fashion.
We can assume that the earlier kitchen utensil was a stick to which a piece of meat could be attached and held over a fire. Later this stick was replaced by an iron rod which could be turned frequently to cook the meat on all sides. Cooking food in water was impossible before man learned to make water containers that could not be destroyed by fire.
All of man' s history has been shaped by his search for food. Man' s first occupation was of that of a hunter, and his first stone weapons were made for hunting. Then man learned to grow plants for food.
They began to settle in communities next to their fields. More people lived in the places where food was more available. Progress has been greater in these parts of the world where there is more food to eat.
In which way may the first cooked food be made？
A．It was accidentally baked on volcanoes.
B．It was cooked by forest fire by chance.
C．It was boiled in the natural hot-water spring.
D．It was cooked by the heat of the sun.
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