半夏必须经过（）后才能内服。

在会计软件中，可以删除的会计科目是（）。

A.已经使用的会计科目

B.非末级会计科目

C.末级会计科目

D.有余额的会计科目

CTC在车站控制台上设置控制模式状态表示灯显示（）灯光，表示非常站控模式。

A、绿色

B、黄色

C、红色

D、白色

中标通知书的发出时间不得超过投标有效期的时效范围是因为( )。

A．投标文件只有在投标有效期内有效
B．投标保证金须在投标有效期内退还
C．招标文件只有在投标有效期内有效
D．投标人有权在此期限内补充或者修改其投标文件

基因的自由组合定律揭示出（）

A、等位基因之间的关系

B、同源染色体上不同基因之间的关系

C、位于非同源染色体上的非等位基因之间的关系

D、表现型之间的数量比接近于9∶3∶3∶1

The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (52) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (53) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (54) cards of all shapes and sizes. The (55) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (56) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (57) the familiar paper currency.

As the Net pushes the economy (58) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world’s largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (59) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (60) This will definitely promote (61) and more efficient cooperation.

61().

A.rougher 

B.mere 

C.serious 

D.greater