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【单选题】
关于while循环和for循环的区别,下列叙述中正确的是( )。A.
while语句的循环体至少无条件执行一次，for语句的循环体有可能一次都不执行
B.
while语句只能用于循环次数未知的循环，for语句只能用于循环次数已知的循环
C.
在很多情况下，while语句和for语句可以等价使用
D.
while语句只能用于可迭代变量，for语句可以用任意表表示条件
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【单选题】What does the little kitten look like?
A.
He's all white but black on the top of his head.
B.
He is small and black.
C.
He is thin and white.
【简答题】应遵守我国《海上交通安全法》的单位和个人有________。
【简答题】按照分离机理，气相色谱法可分为吸附色谱法和（ ）
【简答题】应遵守我国《海上交通安全法》的有________。
【单选题】What is the main idea of this passage?
A.
It is important to be on time for class in the United States.
B.
The importance of being on time differs among cultures.
C.
People learn' the importance of time from the culture they are in.
D.
Students being late for class should explain the reason to their teacher.
【单选题】According to Paragraph 5, social norms will grow______.
A.
diversified
B.
disrupted
C.
balanced
D.
polarized
【单选题】The social norms of a society are determined by ______.
A.
the government
B.
members of the upper class
C.
cultural values
D.
the military
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