题目内容
A．otherwiseB．neverthelessC．indeedD．somewhat
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The purpose of these bridges is to enable people to cross roads safely. Overhead bridges are used in very much the same way as zebra crossing(斑马线). They are more efficient although less convenient because people have to climb up a long flight of steps. This is inconvenient especially to older people. When people use an overhead bridge, they don't hold up traffic. However, when they cross a busy road using a zebra crossing, traffic is held up. This is why the government has built up many overhead bridges to help people and to keep traffic moving at the same time.
For their own safety, people should be encouraged to use them instead of risking their lives by dashing(闯) across the road. Old people, however, may find it a little difficult climbing up and down the steps, but it is still advisable for them to use overhead bridges.
Overhead bridges serve a very useful purpose. This will prevent unnecessary accidents and loss of life.
The advantage of overhead bridges is that ______.
First, sometimes early scientists have an idea which is correct, but scientists in later centuries do not believe it. For example, about 270 B. C., a Greek scientist had an idea which we all believe today: The earth moves around the sun. But for the following 1,600 years scientists did not believe this. In their opinion, the sun clearly moved around the earth. They discovered the truth again only in the fifteenth century!
The second fact of history that many people forget is this: Ancient does not mean primitive. For example, the ancient Egyptians knew a great deal about the stars; they used this knowledge to find their way across the oceans. Two thousand years ago a Greek scientist who lived in Egypt calculated the distance around the earth. The results of his calculations were close to the real distance we know today! So the ancients had a great deal of scientific knowledge. They also had skills which equaled the skills of to- day. For example, 1,300 years ago and before, fishermen in Ireland built their boats of wood and leather. Today some fishermen in Ireland still make boats of the same de- sign. They use tools and materials which are not very different from the tools and materitals which their ancestors used. Why？ The ancient design of the boats was good, and with skillful sailors, these boats can sail in all kinds of weather.
Clearly long before the sixteenth century, people had the skill, the knowledge and the equipment which were necessary for long journeys by sea. The world did not have to wait until the sixteenth century for its first explorers!
Which of the following statements is consistent with the passage？
要约收购的收购人以现金进行支付的，应当在做出提示性公告的同时，将不少于收购总金额30%的履约保证金存放在证券登记结算机构指定的银行账户，并办理冻结手续。 ()
If a person's eye has been looking at an object in bright sunlight for some time, and then
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