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(57)___

20.In October 2007,the Chang'e-l satellite was successfully ＿＿at Xichang.

• A、launched

• B、presented

• C、regulated

• D、engaged

48.Why did M.S.Hershey start the production of chocolate bars?

• A、He was deeply impressed by the Columbian Exposition.

• B、He realized that it was possible for chocolate to become popular.

• C、There was nothing to produce in his factory in Lancaster.

• D、He was interested in the chocolate machinery displayed at the fair.