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问题 解答题

在四边形ABCD中，给出下列论断：①AB∥DC；②AD=BC；③∠A=∠C，以其中两个作为条件，另外一个作为结论，用“如果……那么……”的形式，写出一个你认为正确的命题。

答案

解：在四边形ABCD中，如果AB∥DC，∠A=∠C，那么AD=BC。

阅读理解
阅读理解。
1. Where are the rainforests?
    Rainforests cover six per cent of the Earth’s surface. There are rainforests in many parts of the world
but the biggest forests are in South America, Africa and South East Asia. There aren’t any rainforests in
Europe or North America.
2. What’s in the rainforests?
    About 75% of all the types of animals that we know come from rainforests. Thousands and thousands
of animals live in rainforests. There are many very beautiful birds, insects and reptiles. Many of them live
in the trees, more than 30 metres from the ground. There are also thousands of different plants-and lots of
tall trees! It is always hot in a rainforest and
the ground is always wet. It is also dark.
3. Why are the rainforests important?
    The rainforests are very important for us. We need them! The trees
and other plants in the forest help to make the air that we breathe. They
give us wood, rubber, fruits and many of our medicines.

4.__________________________   
    Unfortunately, in many places, the rainforests are in danger. For example, many years ago there was a
large rainforest in Java. There were thousands of different plants and animals in the forest, but now there
is nothing. People chopped down the trees because they wanted to grow rice. Many animals lived in the
rainforest. Some of them went to other parts of Java but many of them disappeared - forever. The same
thing is happening now in many other parts of the world. The rainforests are in danger.
1. In which of the following places can we find rainforests according to Paragraph 1?
A. In the UK.
B. In Asia.
C. In the USA.
D. In France.
2. Which of the following belongs to a kind of “reptile”?
A. A sparrow.
B. A swallow.
C. A snake.
D. A butterfly.
3. Which might be the best title for Paragraph 4?
A. What’s happening to the rainforests?
B. What can we find in the rainforests in Java?
C. Why did people chop down the trees in the rainforests?
D. Why did many plants and animals disappear in the rainforests?
4. What is the writer’s purpose of writing the article?
A. To tell us how to survive in the rainforests.
B. To help us know some living things in the rainforests.
C. To tell us to care about the protection of the rainforests.
D. To give us advice on how to make full use of the rainforests.
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问答题


已知：ABC公司2009年年初负债总额为4000万元，所有者权益是负债的1.5倍，该年的所有者权益增长率为150%，年末资产负债率为25%，负债的年均利率为10%，全年固定成本总额为975万元，净利润为1005万元，适用的企业所得税税率为25%。
要求：根据上述资料，计算ABC公司的下列指标：

计算企业的经营杠杆系数、财务杠杆系数和复合杠杆系数。
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