公安机关的权力，是指公安机关为履行职责，采取的权威性措施和手段。 ( )

对心肌氧平衡叙述正确的是()

A．冠状循环的血流量与心肌氧耗有关

B．心肌可以从动脉血摄取氧量约为6～10ml/min·100g

C．冠状窦血氧饱和度的正常值为30%

D．心肌储备功能与冠状血流有关

E．心室壁张力增加心肌氧耗增加

People eat different things in different parts of the world.
In south China we eat rice every day. Sometimes we eat it two or three times a day, for breakfast, lunch and supper. We usually eat it with fish, meat and vegetable.
The Japanese eat rice, too. They also eat a lot of fish. They sometimes eat raw (生的) fish. In Africa, maize (玉米) is the most important food. People there make maize into flour(面粉). From this flour they make different kinds of bread and cakes.
In western(西方的)countries such as Britain, Australia and the U. S. A, the most important food is bread or potatoes. People there usually make their bread from wheat flour. They cook the potatoes in different ways. In England the most popular food is fish and chips. Sometimes people cook this food at home, but usually they buy it at the shop. They eat this food at home, in their work place, in the park or on the road. People call it "take-away" food.

Which of the following countries is called "a western country"

A．One of the countries in Africa

B．Japan

C．China

D．Australia

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