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问题 单项选择题

决定A．B及H抗原的基因是控制细胞合成某种特异的

A．抗原的糖链

B．蛋白质水解酶

C．磷脂酶

D．转糖基酶

E．蛋白质合成酶

答案

参考答案：A

解析：

决定A，B及H抗原的基因是控制细胞合成某种特异的糖蛋白的糖链。

选择题
下面各数中，（　　）不是质数．
A．3B．29C．51
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Gallery Policies
for Visitors to National Gallery of Art, Washington
Visitors must present all carried items for inspection upon entry. After inspection, all bags, backpacks, umbrellas, parcels, and other things as determined by security officers must left at the checkrooms, free of charge, close to each entrance. All oversized bags, backpacks and luggage must be left at the checkrooms near the 4th Street entrance of either the East or West Building. These items will have to be x-rayed before being accepted items of value, such as laptop computers, cameras, and fur coats, may not be left in the checkrooms but may be carried into the galleries.
We regret that we do not have enough space for visitor items larger than 17×26 inches into the Gallery or its checkrooms.
Additional security procedures and checks may be taken according to the decision of the Gallery.
For the safety of the artworks and other visitors, nothing may be carried on a visitor’s back. Soft front baby carriers are allowed, but children may not be carried on shoulders or in a child carrier worn on the back. Pushchairs are available free of charge near each checkroom.
Smoking is prohibited. Food and drink are not permitted outside the food service areas. Unopened bottled water may be carried only in a visitor’s bag. Cell phones may not be used in the galleries.
Animals, other than service animals, are not permitted in the Gallery.
Skateboarding is prohibited.
Picture-taking (including video for personal use is permitted except in special exhibitions and where specifically prohibited. Tripods (三角架) are not allowed.
Please do not touch the works of art.
小题1:When people come to visit the Gallery, they should ____________.
A．leave all their carried items at the checkrooms
B．have all their carried items x-rayed at the entrance
C．take all their carried items with them without inspection
D．have all their carried items inspected at the entrance
小题2:What does the Gallery feel sorry for?
A．Visitors have to keep their valuable items in the checkrooms.
B．The size of visitor items allowed into the Gallery is limited.
C．It cannot keep oversized visitor items due to limited space.
D．Visitor items over 17×26 inches must go through additional checks.
小题3:Parents with small children visiting the Gallery _____________.
A．can carry their children in soft front child carriers
B．can carry their children on their shoulders
C．can carry their children in child carriers worn on the back
D．ought to pay if they want to use pushchairs for their children
小题4:Visiting photographers should make sure that __________.
A．pictures and videos are allowed for personal use anywhere in the Gallery
B．pictures and videos can be taken in some places for personal use
C．picture-taking and videoing are totally forbidden in the Gallery
D．tripods are allowed except in some special exhibitions
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