Starting at the point of equilibrium between the money supply and the money demand, a decrease in the demand for money in the home country causes the value of the home currency to:

Believe it or not,optical illusion (错觉) can cut highway crashes. Japan is a case in point. It has reduced automobile crashes on some roads by nearly 75 percent using a simple optical illusion. Bent stripes, called chevrons (人字形) painted on the roads make drivers think that they are driving faster than they really are, and thus drivers slow down.

Now the American Association Foundation for Traffic Safety in Washington D. C. is planning to repeat Japan's success. Starting next year, the foundation will paint chevrons and other patterns of stripes on selected roads around the country to test how well the patterns reduce highway crashes. Excessive speed plays a major role in as much as one fifth of all fatal traffic accidents, according to the foundation. To help reduce those accidents, the foundation will conduct its tests in areas where speed-related hazards are the greatest--curves, exit slopes, traffic circles, and bridges. Some studies suggest that straight, horizontal bars painted across roads can initially cut the average speed of drivers in half. However, traffic often returns to full speed within months as drivers become used to seeing the painted bar. Chevrons, scientists say, not only give drivers the impression that they are driving faster than they really are but also make a lane spear to be narrower. The result is a longer lasting reduction in highway speed and the number of traffic accidents.

The passage mainly discusses ______.

A．a new way of highway speed control

B．a new pattern for painting highways

C．a new approach to training drivers

D．a new type of optical illusion

A.Record

B. Datafile

C. 指针

D. 变量

The electric potential V in a region of space is given byin SI, where A is a constant. The x-component of electric fieldat poin (x,y,z)=(2,0,2) is .

A.Record

B.Datafile

C.指针

D.变量

We haven't got all day, so please_____ to the point.

A. make

B. work

C. go

D. get

A.Record

B.atafile

C.指针

D.变量

A．Flash Poin

B．Flammable Liquids

C．Combustible Liquids

D．Pulmonary function tests and blood tests

A．To share with others her experience.

B．To show her husband.

C．To prove a previous point.

D．To show her abilities.

I feel it is necessary for me ______ your shortcomings,

A．to pick on

B．to remind of

C．to point out

D．to mention