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【单选题】
下列关于系统误差的叙述中错误的是（）。A.
某些经常性的原因造成误差
B.
系统误差是不可测的
C.
系统误差对分析结果影响比较恒定
D.
系统误差不影响测定结果的精密度
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【单选题】What is true of human sleep?
A.
Most people need less sleep when they grow older.
B.
Most people need seven and a half hours of sleep every night.
C.
On average, people in the US today sleep less per night than they used to.
D.
For most people, less than six hours of sleep on a typical work night is enough.
【单选题】What，according to the writer，is one of the most important tasks of our time?
A.
To keep people from agin9．
B.
To practice birth．contr01．
C.
To make people still stronger．
D.
To do away with starvation and disease．
【简答题】Most people do not equate wealth with a big house or yacht(游艇). In fact, only 7% of people surveyed associate wealth with material possessions like cars, houses and boats. Rather, to many, being rich ...
【简答题】What do the speaker most probably do in the future?
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