In the sentence "Patients who need long, term medical care because of advanced age or chronic illness may stay in a nursing home. ", here "chronic" means ______.
A. long-term
B. short-term
C. lasting for a long time
D. constant
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Bargaining is not common in shops, and customers are expected to pay the marked price for
A. 讨价还价在商店里是不平常的，并且顾客应按市场价付款。
B. 讨价还价在商店里是不普通的，顾客期望是按标明的货价付款。
C. 讨价还价在商店里是不常见的，顾客被期望按标明价买货物。
D. 讨价还价在商店里是不常见的，顾客应按标明的货价付款。
What is the main idea of the second paragraph？
A. Over 6000 languages and major dialects are spoken in the world today.
B. As some languages grow, others disappear.
C. Languages that grow also develop and change due to class, profession, age group, and other social forces.
D. Anthropologists are trying to record and preserve ancient languages that are still spoken in remote areas or by the last remaining people in a culture.
某机字长8位，含1位数符，采用原码表示，则定点小数所能表示的非零最小正数为 ()。
A. 2-9
B. 2-8
C. 1-2-7
D. 2-7
Has difficulty speaking in front of other people
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