What can be inferred from the news？
A. US President Obama has only focused on the world security issues in his speech.
B. US President Obama's visit to Moscow aims to build better relations with Russia.
C. Russia and America have reached consensus on most world security and economic issues.
D. US President Obama has delivered a speech to graduates of a polytechnic institut
查看答案
A．sourcesB．resourcesC．originsD．roots
A. sources
B. resources
C. origins
D. roots
According to this passage, ______.
A. the game plan for keeping brain cells sparking doesn't work for everyone
B. Dr. Small's memory tests can show you what to do about brain aging
C. Dr. Small's advice can help us fight brain aging effectively
D. our brains can reconstruct memories themselves
In regard of leadership competencies, the author suggests that people have ______.
A. believed in their existence
B. learned to apply them extensively
C. found it very difficult to acquire them
D. been unable to realize their importance
In this passage, the author mainly tells us that ______.
A. everyone can be forgetful sometimes regardless of one's age
B. we can prevent our sound mind from aging with certain methods
C. brain aging starts from the time when we are in our 20s and 30s
D. memory loss is a sign that shows we are getting old
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