问题
单项选择题
"Re-administration" in this passage refers to giving ______.
A．the test again to people without administering beta blockers
B．the test again to both groups after beta blockers have been administered to one group
C．the test to both groups of test-takers and then giving them beta blockers
D．the beta blockers without retesting
答案
参考答案：B
解析：[分析] 词义题型。 见文中：…to reduce the anxiety of these students who had already been tested，he gave 22 of them a beta blocker before readministration of the test．为减轻这些已参加过测试的学生的焦虑，他给其中22人服用了β-受体阻滞药，然后又给他们做了次测试。因此选项B．“一组人(22人)服用β-受体阻滞药后再给两组做了次测试”是正确答案。