题目内容

，and other things which make up the weather.11 without knowing about the rest of the 12，one cannot understand lightening and thunder. Long ago，13 scientists had begun to study the weather，everyone was afraid of lightening and thunder. 14 the ancient Greeks and Romans，thunder was the angry voice of 15 great god Zeus，or Jupiter.
Today we know more about weather and 16 lightening and thunder too，though there 17 still much to be learned. People today are not often afraid of thunderstorms，though we know that lightening 18 dangerous. 19 we understand lightening and thunder，there is a thrill (激动) in watching a summer thunderstorm which clears the air and leaves us 20.
11.[A] So [B] If [C] For [D] Yet
12.[A] weather [B] whether [C] wonder [D]wander
13.[A] before [B] after [C] since [D] when
14.[A] For [B] To [C] As [D] About
15.[A] its [B] his [C] their [D] one’s
16.[A] in [B] about [C] on [D] of
17.[A] are [B] was [C] is [D] were
18.[A] can be [B] must be [C] need be [D] should be
19.[A] While [B] Although [C] So [D] Because
20.[A] to relax [B] relaxing [C] relax [D] relaxed

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False teeth have been found in Italy in human heads that are over 2,500 years old. They were made of bone and set in gold. However，for hundreds of years afterwards，the apparent dental skill of those early people was lost. Without false teeth people looked old before their time，since so many lost their teeth at an early age.
Toward the end of the 17th century，rich people could buy false teeth made from ivory. The teeth were tied together with silk thread，but it was difficult to keep them in the mouth. That was why rich people would rather buy teeth from the poor who would often sell their teeth to buy food and clothing.
Early in the 18th century a French doctor used steel springs to hold teeth in place. However，it was difficult to close one‘s mouth! Late in the same century porcelain (瓷)teeth set in gold were often used to make false teeth.
Although the use of artificial teeth increased，human teeth continued to be used also. In the 19th century，teeth from soldiers killed in battle were made into artificial teeth. For example，teeth from the dead in the American Civil War were sent to England.
By the middle of the 19th century，an American doctor，Claudius Ash，invented a better kind of porcelain tooth made of a special kind of hard rubber.
26.When did people with the earliest false teeth live according to the passage？
[A] At the end of the 17th century.
[B] In the early 18th century.
[C] In the middle of the 19th century.
[D] Over 2,500 years ago.
27.Which material would wealthy people use to make artificial teeth in 1693？
[A] Porcelain.
[B] Hard rubber.
[C] Ivory.
[D] Bone.
28.Who first used steel springs to tie false teeth together according to the passage？
[A] An Italian doctor.
[B] A French doctor.
[C] An American doctor.
[D] An English doctor.
29.We can learn from the passage that _.
[A] one looked older than his real age with artificial teeth
[B] we are using the same method as ancient people in making false teeth
[C] poor people would often sell their teeth to get money in the 17th century
[D] human teeth were no longer used in making false teeth after the 18th century
30.The passage is mainly about _.
[A] the discovery of false teeth
[B] the material of false teeth
[C] the use of false teeth
[D] the history of false teeth Passage Three

她对学习的态度给我们留下了深刻的印象。

All the food that ______ (keep) our bodies strong, was once in the vegetable form.

他提到了那个计划，但未说明细节。