There_____________ a pen and two pencils

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问题选择题

There _____________ a pen and two pencils in the box. [ ]

A. are

B. is

C. has

D. have

答案

答案：B

单项选择题

Under perfect competition, a firm will experience zero long term economic profit when:（）

A. price is less than average total cost.

B. MR is greater than ATC.

C. MC = ATC = MR = price.

单项选择题

男性，58岁，有高血压病史，于情绪激动后，突然出现头痛、呕吐，左侧肢体活动不利，随之意识不清，血压190/110mmHg，瞳孔不等大，右侧大于左侧，左侧肢体瘫痪，最大可能的诊断是

A．脑栓塞

B．脑出血

C．TIA

D．脑血栓

E．蛛网膜下腔出血