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问题 单项选择题

在CT影像上辨别正常胰腺头、体交界部时，其背侧血管应该是()

A．腹主动脉、下腔静脉

B．腹腔动脉或肠系膜上动脉

C．门静脉和肠系膜上静脉

D．肾动脉和右肾静脉

E．以上都不对

答案

参考答案：B

单项选择题 A1/A2型题

关于黄曲霉毒素的结构和理化特性的描述，错误的是（）。

A.二呋喃环末端有双键的毒性大

B.耐热，一般烹调方法不能破坏

C.在紫外光照射下产生荧光

D.皆溶于水

E.在碱性条件下，其内酯环易破坏
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单项选择题

Today, the Indianapolis 500, one of the world’s most famous car races, takes about four hours to run. If the Indy 500 had been held in 1895, it would have taken almost three days. The horseless carriage had just been invented a short time before. Top speeds back then were much lower than they are today. For most people, just seeing a car move without a horse pulling it was thrilling enough. The driver’s main concern was making sure the car didn’t break down.
One of the first car races was held in Chicago on Thanksgiving Day in 1895. Folks crowded the streets to gawk at the new machines. The route of the race went through the heart of town. The cars were to go out to a nearby suburb and back. The race covered a distance of about 54 miles. That’s less than one-tenth the distance at Indy. The drivers cranked up their engines and prayed that they wouldn’t break down. Then they were off. The race proved too much for some of the cars. Perhaps they couldn’t withstand the high speeds. The winner of the contest was J. Frank Duryea. He finished the race a bit more than seven hours after he started. He had covered the grueling distance at an average speed of 7.5 miles per hour. That is slower than a modern marathoner can go on foot. Even so, as Duryea finished, the crowd went wild.

What can you conclude about the public’s attitude toward auto race

A．They were more impressed with slower speed.

B．They thought cars were unnecessary.

C．They enjoyed just seeing the cars.

D．They were easily bore
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