[单项选择]Financial derivatives also provide a powerful tool for limiting risks that individuals and firms face in the ordinary conduct of their business. This is an example of:

[单项选择]The parties can also provide ______ for facilitating cooperation and regulating conflict among different parties.
A. appliances
B. mechanisms
C. organisms
D. accessories

[单项选择]The parties can also provide______ for facilitating cooperation and regulating conflict among different parties.
A. appliances
B. mechanisms
C. organisms
D. accessories

[单项选择]Athletes, musicians and powerful business executives are not necessarily role models because______.
A. skill cannot guarantee happiness and fulfillment
B. they lack character
C. skill is not necessary for success
D. they are just heroes

[单项选择]How the writer started smoking shows the powerful influence of

[单项选择]Suspicious of too powerful a President, Americans nonetheless are ______ when a President does not act decisively.
A. unified
B. indifferent
C. content
D. uneasy

[单项选择]The most powerful protection against deviance is ______.

[单项选择]Global users can access the powerful search engine to locate any of the 9,000 of companies archived by name, ______ or code number.
A. sector
B. section
C. segment
D. selection

[单项选择]

Text 1
A tiny but powerful new lightweight drill has been developed by space scientists and engineers. It expands the fields in which drilling has been difficult in the past. The new drill could be used in the drilling required during surgical or diagnostic procedures involving bones, or when extracting heart pacemaker leads. Future space missions could include drilling for rock and soil samples, using only lightweight landing vehicles with robotic arms.
The color photo shows the new driller penetrating a sandstone while the drill is held only from its power cord. Relatively small vertical force is used in this application -- a factor that will be useful when the drill is used in future space missions and weight needs to be kept to a minimum. The drill is driven by piezoelectric devices, which have only two moving parts but no gears or motors. Piezoelectrics are materials that change their shape under the application of an electrical field. The drill can be
A. be used in space missions.
B. pull out the heart pacemaker leads.
C. replace the conventional rotary drill.
D. drill the bones during procedures of medical treatment.

[单项选择]In the sentence "Using a moderately powerful desktop computer running a music composition program and a '500 synthesizer" (paragraph 2) , the word "moderately" has the meaning of ______.


A. properly
B. slightly
C. less
D. a little

[单项选择]The author says that the powerful computers of today______.