关于视神经，错误的是()
A．眶内段最长，活动度最大
B．视神经鞘膜内间隙与大脑同名间隙相通，故颅内压升高易出现视 * * 水肿
C．筛板前视神经无髓鞘
D．视 * * 血供全部来源于Zinn环
E．视神经管内段神经鞘膜与骨膜紧密结合，因此外伤时易受损伤
参考答案：D
解析：视 * * 表面神经纤维层由视网膜中央动脉毛细血管供血，筛板前血供来自Zinn环。
These days，cars are designed using computers．Let’s look at how a new car is created． First，several 16 talk about the new car and any good ideas that they have．Then they sit down at their computers and 17 many sketches．The best two or three drawings are chosen and then more detailed drawings of 18 are developed on the computer．You can change the size，shape or color of any part on the computer to see 19 the car would look and then you can choose the best design． Both the inside and the outside of the car have to be designed．Part of the inside of the car is 20 so that the designers can sit in it．They can feel if there is enough 21 inside and if they can reach 22 ．Then some cars are built-there are more than 15，000 parts of a car to 23 ． When everything is known to be 24 ，the cars are made in the factory．Again，computers are used to make sure that all the parts are 25 as they are needed．The factory usually stays open all through the night so that the car production never stops．
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