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问题 单项选择题

女孩，10岁。上午8时升旗时突然昏倒，意识丧失2～3min，不伴肢体抽动，EEG及EKG正常。其诊断最大可能是上述哪项

A．晕厥
B．屏气发作
C．癔病性发作
D．习惯性阴部擦腿
E．多发性抽动

答案

参考答案：A

完形填空

Directions: Read the passage carefully and then translate the underlined sentences into English or Chinese. Write your answer on your answer sheet.

Have you ever considered a trip to Shangri-la!? The British writer James Hilton described a beautiful kingdom 【1】.where three rivers joined together, steep mountains reached to the sky, and fields of long grass covered the earth. Three mountains, Meili, Baimang and Haba, which are covered with snow, tower over the land. Below the mountain, the sunshine reflects on the many lakes, 【2】.making them shine like diamonds against the rich countryside. Lakes, surrounded by vast grassland, look like jewels. Sheep, cows and horses feed freely on the green grass and 【3】.forests around are home to lots of birds and animals. In this peaceful world, 【4】. 人们与大自然和谐相处and the noise and the worry of the outside world are forgotten. Nature has provided Shangri-la with endless natural treasures, making the land a happy home for the local people. In this perfect world lived people who had discovered 【5】. 如何永葆青青.The weather changes so quickly that people say you can experience four seasons in one day. The best time to visit Shangri-la are spring and autumn when the temperature is at it mildest.
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单项选择题

对真核细胞mRNA的描述，下列哪个是不正确的

A．三类RNA中mRNA的合成率和转化率最快

B．生物体内各种mRNA的长短差别很大

C．在5'端有帽子结构，在3'端有聚A尾巴

D．聚A尾巴是DNA的转录产物
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