问题
选择题
中学生身高1.5m，在阳光照射下影长为1m，若此时测得旗杆的影长为4m，则旗杆高为[ ]
A．6m
B．7m
C．8m
D．9m
答案
答案：A
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中学生身高1.5m，在阳光照射下影长为1m，若此时测得旗杆的影长为4m，则旗杆高为[ ]
A．6m
B．7m
C．8m
D．9m
答案：A
| Mr. Faugel was convinced that student nervousness had affected their scores; 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. Their scores improved significantly. The other 8 students (who did not receive the beta blockers) improved only slightly. Second-time test-takers nation-wide had average improvements which were similar to those in Faugel’s non-beta blocker group. Beta blockers are prescription drugs which have been around for 25 years. These medications, which interfere with the effects of adrenalin, have been used for heart conditions and for minor stress such as stage fright. Now they are used for test anxiety. These drugs seem to help test-takers who have low scores because of test fright, but not those who do not know the material. Since there can be side effects from these beta blockers, physicians are not ready to prescribe them routinely for all test-takers. |
Why are beta blockers not prescribed regularly
A．Students are expected to do poorly.
B．There are side effects.
C．The drugs are only 25 years old.
D．They cause test anxiety.