断层遮挡油气藏有什么特点？

Here are some letters for you and he.

切削用量是切削速度、进给量和背吃力量的总称

硅酸盐耐火浇注施工完后，宜于()养护。

A.过热蒸汽

B.浇水

C.恒温

D.自然

关于房地产经纪机构的代理形式，以下说法中不妥的是( )。

A．对于功能复杂的大型综合性房地产开发项目，开发商可以委托联合代理，也可以委托独家代理

B．对于双重代理，经纪机构可以同时向买卖双方收取佣金，但佣金总额一般不能高于前两种代理形式之和

C．经纪机构如果是双重代理，则其身份应向有关各方事先声明

D．开发商或业主可以直接委托分代理

E．分代理的委托必须得到开发商或业主的同意

National parks in the UK are a wonder to see, run by the National Trust, a non-profit charity which maintains Great Britain's historical and natural landscapes. Britain's park Authority has made planning restrictions to protect these wilderness areas in housing and commercial activities.

Mainland England and Wales have the largest number of protected parks. The first established area was the l,438 kilometer Peak District. The first national park lies in northern and central England. The Peak District with vast beauty is thought to be the world's most visited national park after Japan's Mount Fuji.

In the northwest area of Wales lies Snowdonia National Park. This attractive, mysterious ancient landscape is home to steep mountains. Walking trails to Mount Snowdon is only one of several exciting activities for hikers.

National parks in the UK can also boast of having Britain's largest protected wetland "The Broad", just outside the village of Homing. An ideal spot for families, this 200-mile area combines waterways with an interesting intersection(交叉) of windmills, castles and an ancient Normal church.

Spreading across 885 miles of truly impressive rocky land is Lake District National Park. England's largest park attraction is spread between Edinburgh to the north and Manchester to the south. Although the land itself seems wild, almost 40,000 people live within the park. Within this district's vast borders we can find over 6,000 archaeological(考古的) sites and monuments dating back to prehistory.

The United Kingdom has taken great care to preserve its wilderness areas for the future generations, and all the parks are adventures waiting to De found which can be enjoyed by both natives and visitors.

小题1:Who is in charge of the National parks in the UK? (no more than 3 words)

小题2:According to the passage, which is thought to be the world's most visited national park? (no more than 5 words)

小题3:If you want to see ancient monuments, where would you go? (no more than 4 words)

小题4:For whom are the wild areas preserved in the UK? (no more than 4 words)

小题5:What's the text mainly about? (no more than 6 words)