题目

    In the American colonies there was little money．England did not supply the colonies with coins and it did not allow the colonies to make their own coins．Only the Massachusetts Bay Colony received permission for a short period in 1652 to make several kinds of silver coins．England wanted to keep money out of America as a means of controlling trade：America was forced to trade only with England if it did not have the money to buy products from other countries． The result during the pre-revolutionary period was that the colonists used various goods in place of money：beav如图为一阴极射线管接通电源后，K极射出电子流，水平流向A，若在其上方附近有一水平放置的直导线，导线中的电流从左向右，则电子流将（ ）A．向上偏转B．向下偏转C．向纸外偏转D．向纸内偏转