下列哪种维生素缺乏可使成釉细胞不能分化成高柱状细胞而蜕变成扁_爱下问搜题

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问题单项选择题

下列哪种维生素缺乏可使成釉细胞不能分化成高柱状细胞而蜕变成扁平细胞进而造成牙釉质发育不全

A．维生素E

B．维生素D

C．维生素C

D．维生素B

E．维生素A

答案

参考答案：E

阅读理解

Have you ever been to London? Here is some hotel information for you.

Kingsway Hall Hotel
We offer quality service (优质服务) in Kingsway Hall Hotel. This location puts guests in easy reach of many places, such as the British Museum and Piccadilly Ci

rcus. Our hotel also has modern Western food, and offers a perfect dining environment. The lounge bar is a comfortable place to enjoy a drink while
watching the touri

sts. There are hundreds of dining choices within walking distance. Non-smoking rooms
are ready for guests.
     Hilton Docklands Riverside
     Located on the bank of the Thames, our hotel is about two miles east of Tower Bridge and 36 miles
from London Heathrow Airport. Our hotel has a beauty salon, a flower shop and a swimming pool. The
hotel also offers laundry (洗衣店) services, babysitting, shining shoes, and local area transportation.
     Windermere Hotel
     Located in the center of London, our hotel puts guests within easy reach of London's well-known
buildings. Buckingham Palace and the Royal Parks are just a short walk away. Within 1.5 miles you can
visit Westminster Abbey and the Houses of Parliament. The theatres, Harrods shopping centre, and the
designer shops of Sloane Square and Knightsbridge are all only a short walk away or a taxi ride away.

1. What does Kingsway Hall Hotel provide for its guests?

A. Chinese food.
B. A lounge bar.
C. Smoking rooms.
D. A swimming pool.

2. What is special about Hilton Docklands Riverside?

A. It offers different kinds of service.
B. It offers a reasonable price.
C. It has convenient transport.
D. It has delicious food.

3. This passage is most likely to be found in ______.

A. a travel guide
B. a story book
C. a technical report
D. a geography magazine

单项选择题

在室内设计中针对不同的人，不同的使用对象，相应的应该考虑不同的需求例如：幼儿园的窗台，考虑到适应幼儿的尺度，窗的高度正常应改为（）.

A.900~100MM

B.500~600MM

C.400~500MM

D.450~550MM