[单项选择]All children （） a loud laugh when their father told them the funny story.
A. let off
B. let down
C. let out
D. let up

[单项选择]All children（）a loud laugh when their father told them the funny story.
A. let off
B. let down
C. let out
D. let up

[单项选择]All students ______ a loud laugh when professor Henry Mitchel told them the joke.
A. let off
B. let down
C. let out
D. let up

[单项选择]All students in the class ______ a loud laugh when the professor told them a joke.
A. let up
B. let down
C. let off
D. let out

[单项选择]A user is reporting a loud grinding sound when the machine is powered on. The machine loadsinto windows and the user does not notice any performance issues. Which of the following is the MOST likely cause of the noise?（）
A. Powersupplyfailure
B. BadHD
C. Badfan
D. FaultyCD-Rom

[单项选择]

Personal interviewing is most effective when all the people to be interviewed are located in a relatively small geographical area. Otherwise, the time and expense spent in travelling from one person to another makes this type of interviewing economically impractical. Personal inter viewing is usually used when the information needed is too complex to be gathered by another technique. For example, a problem being studied may require the interviewer to probe beyond the more superficial answers that might be obtained with another method.
It is sometimes assumed that personal interviewing is the most accurate of all survey re search techniques. Although personal interviewing may be accurate in many cases, human errors may prevent a researcher from obtaining valid results. Questions perceived by the interview wee as an invasion of privacy or threatening in any way will probably produce false of partially true answers. Also, since the interviewer must interpret the respo
A. the interviewer can ask the interviewee questions again in different ways
B. the interviewer can ask the interviewee some personal questions
C. the initial question do not produce the information desired
D. no one is present to clarify questions

[单项选择]It can be concluded from the passage that when all the people to be interviewed are located in a relatively big geographical area ______.
A. personal interviewing is most effective
B. personal interviewing is economically impractical
C. personal interviewing is the only technique to get information
D. telephone interviewing may not be used

[单项选择]Jack's father thought most children went to school by taxi.

[单项选择]What shall we use for power when all the oil in the world has ______
A. given out
B. put out
C. held up
D. used up

[单项选择] When all the present oilfields are__ , its is possible that the North Pole may become the scene of oil activity.(46)
A. exhibited
B. exhausted
C. exploited
D. exposed

[单项选择]Hardly （） when a loud explosion was heard.
A. the train had started
B. the train had been started
C. had the train started
D. did the train start

[单项选择]Birthdays axe such happy ______ when all your old friends can get together and have a good time.
A. days
B. occasions
C. cases
D. holidays

[单项选择]A father should know how to help his children to stand alone." To stand alone" means all the following except " ______".
A. to get along well by themselves
B. to live on their own
C. to live lonely
D. to live without the help of others