X线照射生物体到发生生物学阶段的变化时间为（） A.数秒 B.数十秒 C.数分 D.

Perhaps, every county suffered from inflation once or more times. Inflation is an economic condition in (B1) prices for consumer goods (B2) , and the (B3) of money or purchasing power decreases. There are three causes of inflation. The first and most important cause may be excessive government spending. For example, in order to (B4) a war or carry (B5) social programs, the government may spend more money than it has received through taxes and other revenues, thus creating a deficit. In order to (B6) this deficit, the Treasury Department can simply (B7) the money supply by issuing more paper money to (B8) the debts of government. This increase in the money supply will cause the value of the dollar to (B9) decrease. The second cause of inflation occurs when the money supply increases faster than the supply of goods. (B10) people have more money, they will run out to buy popular goods (B11) televisions and computers, for example, and a shortage will result. Industry will then produce more, at higher prices, to (B12) demand. (B13) , if people think that the prices of popular goods are going up, they will buy and even borrow money at high (B14) rates to pay for them. Finally, if labor unions demand that workers’ wages (B15) or (B16) the high cost of living, industry will meet this demand and add other costs of production on the (B17) . (B18) summary, all of these causes can (B19) inflationary problems that can affect the welfare of a nation. However, of these three causes, (B20) government spending may be the most important.

A．On

B．At

C．In

D．By

下列语句中不是命题的是[ ]

A.延长线段AB

B.自然数也是整数

C.两个锐角的和一定是直角

D.同角的余角相等

两种练习本，一种是5元6本，一种是3元4本，这两种练习本的单价比是______．

患者，男，2006年大学毕业，同年5月右腿麻木，8月左腿也麻木，9月出现行走困难，11月在当地医院行手术探查为T2、3脊髓血管畸形后关闭。在手术探查伤口愈合期间病情加重，出现胸以下感觉异常，双下肢瘫痪，大小便失禁。2007年2月11号转某大医院诊疗，诊断为T2、3脊髓畸形，神经外科医生叫患者放弃，说做不做都会瘫痪。但患者家属执意要求医生为其孩子做手术。上述病例从伦理学上分析，下述哪一个说法是正确的（）

A.医生的说法是正确的

B.医生应耐心给家属解释此病的危害，叫患者家属接受事实

C.医生的做法是错误的，他应尽医生最大的责任给予治疗，将损害减少到最低限度

D.患者家属应听从医生的安排

E.以上都不对