What is the bid-ask spread（）

What risk does the bid-ask spread mostclosely measure:

A.Liquidity risk.

B.Credit spread risk.

C.Inflation risk.

Dealers will quote a narrow bid-ask spread for a particular issue if______.

A．the volume of transactions in that issue is large

B．the price volatility of that issue is low

C．competitive pressures are high

D．all of the above

"AIDS has spread both numerically and geographically." What does the statement mean？

A．The disease has spread to many countries in the world.

B．The disease has spread to large numbers of people.

C．The disease has spread very fast in Africa.

D．The disease has spread in number and from place to place.

According to the passage, what was the strategy used to eliminate the spread of smallpox？

A．Vaccinations of entire villages.

B．Treatment of individual victims.

C．Isolation of victims and mass vaccinations.

D．Extensive reporting of outbreaks.

What ______ do the health authorities take to prevent the spread of epidemic？

A．steps

B．plans

C．paces

D．grounds

According to the passage, what was the strategy used to eliminate the spread of smallpox？

A．Vaccinations of entire villages.

B．Treatment of individual victims.

C．Isolation of victims and mass vaccinations.

D．Extensive reporting of outbreaks.

What had helped to spread the prosperity more evenly？

A．The maturity of management.

B．The interference of the government.

C．The growth of organized labors.

In what way is obesity contagious and epidemic？

A．Social networks let the obesity spread rapidly.

B．Individuals have genetically determined ranges of weights.

C．Obesity can easily spread from one to another without any physical contact.

D．Obesity can spread rapidly and extensively by infection and affecting many individuals in an area or a population at the same time.