Happiness is contrasted with eye color because happiness __________.
A. does not have a color
B. is not physical
C. cannot be seen
D. may not last
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Many Mayan cities and temples__________ .
A. were constructed by the priests
B. were built with heavy stones
C. were rebuilt several times
D. were the miracles of god
“一国两制”是指在一个中国的前提下，在大陆实行_______制度，在香港、澳门、台湾保持原有的_______制度和生活方式长期不变。
at our store in the Sydney Airport.
A. hold
B. advantage
C. notice
D. account
设函数z=cos(x2+y2)，则(δz/δx) _______．
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