According to the passage, which of the following causes Alzheimer's disease？
A. Sever emotional stress.
B. Nutritional deficiency.
C. The death of nerve cells in the cerebral cortex.
D. Severe head trauma.
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In" The major debilitating symptoms of Alzheimer's disease include serous forgetfulness --
A. deceasing
B. declining
C. serious
D. degrading
Which of the following is true？
A. If a language is not good for practicality, we can drop it.
B. We can understand another cultural and intellectual system by learning language.
C. Time devoted to language teaching has never declined.
D. We should spend more time in learning language than playing chess.
______ , he always tries his best to complete it on time.
A. However the task is
B. However hard the task is
C. Though hard the task is
D. Though hard is the task
The news item mainly about
A. meat canning, a tradition in American church groups.
B. American church groups' canning food for those in need.
C. how to can food in American church groups.
D. die canned food delivery all over the world.
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