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问题 单项选择题

女患者，32岁，发热、头痛、呕吐3天，有体重减轻史2周，有肺结核史3年。查体颈抵抗感，克氏征可疑。需进一步检查下列哪一项检查助确诊（）

A.血常规

B.脑脊液抗酸涂片

C.脑脊液墨汁染色

D.血脂血糖检查

E.胸部透视

答案

参考答案：B

实验题

某学生用螺旋测微器在测定某一金属丝的直径时，测得的结果如图(a)所示，则该金属丝的直径d=____mm；另一位学生用游标尺上标有20等分刻度的游标卡尺测一工件的长度，测得的结果如图(b)所示，则该工件的长度L=____cm。
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单项选择题

You have probably seen ads (广告) in newspaper or on television for mail-order companies. Perhaps a catalogue (商品目录) has been sent to you. Why do people buy things they have not seen in person Some people believe that things can be bought more cheaply by mail. Another good thing about buying by mail is that it is easier and more enjoyable to sit at home and work through a catalogue than to shop around the stores. With a catalogue from a large company, you have your own shop window for almost everything you want to buy.
Buying from a catalogue is so easy. It saves the shopper’s time and trouble. Sometimes, it saves the shopper’s money, too. But people often buy more than they can really afford(付得起) or need, because many things look so good to them. They can probably pay a certain part of the full price—a down payment. Then they pay a certain amount of money every month until the goods is paid for in full. But by then they often find what they have bought are of no use at all.

Why do people buy things without seeing them in person
[A] To enjoy themselves.
[B] To save money and trouble.
[C] To get more than they need.
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