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在Shell变量引用操作符可实现字符串替换其中()用来测试,如果变量stra存在，则返回为变量stra的值,否则输出为word,并退出当前脚本程序
A.${stra-word}
B.${stra=word}
C.${stra:+word}
D.${stra:？word}
在Shell变量引用操作符可实现字符串替换其中()用来测试如果变量stra存在且不为空，则返回为word,否则返回为空串
A.${stra:-word}
B.${stra:=word}
C.${stra:+word}
D.${stra:？word}
A “process” conversation has to do with ________.
A) the application of reading strategies
B) matching our expectations with the meaning of a text
C) the development of our ability to check the details
D) determining the main idea of a text
A．towing bridle
B．main weather cover
C．external lifelines
D．righting stra
What did Zed Hawks do during the TV interview？
A．He behaved much better.
B．He wore very strange clothes.
C．He sang a song angrily.
D．He walked out during the interview.
What we know from the passage is that Mrs. Manstey was ______.
A．a lonely old woman
B．a strange and mad old woman
C．a sociable old woman
D．a respected and pleasant old woman
听力原文：M: Excuse me, can you tell me how to get to the city library？
W: Sorry, I'm a stranger here myself. Why don't you ask the policeman over there, near the bookstore？
Q: What did the woman suggest to the man？
(14)
A．Buying a map.
B．Asking the store manager.
C．Making a phone call.
D．Asking the policeman.
B．They both need a sampling frame of each of the subgroups of the target population.
C．In both of them,researchers want to ensure that all strata are included in the sample in order to enhance the representativeness of the sample and/or to enable comparisons between strA
D．Stratified sampling does not need a sampling frame to generate a stratified sampl
E．
E．In both of them,once the sample number of each subgroup is defined,samples are drawn in simple random sampling or systematic sampling metho
D．
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