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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
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