If a rigid body undergoes translation, then the motion path of a point on the rigid body（）
A. must be a straight line
B. must be a planar curve
C. cannot be a spatial curve
D. could be a spatial curve
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Which of the following is NOT supposed to be done by self-motivated employees（）
A. Cultivating a hobby
B. Overworking at weekends
C. Looking for motivators
D. Renewing goals
文章见教材第55页 UNIT3 Passage one1. What is the main purpose of the passage（）
A. To outline contrasting types of economic systems
B. To explain the science of economics
C. To argue for the superiority of one economic system
D. To compare barter and money-exchange system
The passage is mainly written to _____（）
A. talk about job choices
B. analyse a social phenomenon
C. encourage celebrity culture
D. introduce three famous people
According to the writer, lifetime learning can be exciting if _____（）
A. we are prepared for the changes
B. we know who President has on his support team
C. we read the publications of advanced institutions
D. we learn English or some other foreign languages
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