[填空题]To make metamaterials work for all lights in the visible spectrum is rather difficult because of the limitation of ______.

[填空题]To make metamaterials work for all lights in the visible spectrum is rather difficult because of the limitation of ______.

[填空题]People can make work related injuries worse by aggravating them with bad habits outside the office.

[简答题]How may different arrangements can you make of all the seven letters in the word COMBINE

[单项选择] Make Meetings Work for You
Only call a meeting if you (and your colleagues) are quite clear about its purpose. Once you are certain of your objective, ask yourself whether it could be better achieved through (19) means, such as a memo. Meetings called on a routine basis tend to (20) their point. It’s better to wait until a situation or problem requires a meeting. If in doubt, don’t waste time having one.
If you’re sure a meeting is the solution, circulate a memo several days in advance (21) the time and place, objectives, issues to be discussed, other participants and preparation (22) Meetings should be held in the morning, if possible, when people are usually more (23) , and should last no more than an hour. Six is the (24) number of participants for a good working meeting. Inviting the whole department (more than 10) increases emotional undercurrents suc
A. selective
B. optional
C. practical
D. alternative

[单项选择]The men work all week in the factory, and at the end of the week they get their pay. Naturally enough, they open the envelopes and they all count the money. One man is standing in the corner. He’s counting his money. Suddenly he realizes that it is wrong. He counts the money again. No doubt about it--there is a mistake. There is too much. Five pounds too much. He puts his money carefully in his pocket and says nothing to the others. A week goes by. It’s payday again. The men are counting their pay. The same man is standing in the comer. Suddenly he starts shouting. This time there isn’t enough money in his envelope. It’s five pounds short. He goes immediately to see the boss. He is very angry.
"Look," he says, "there isn’t enough money in my pay envelope." "That’s right," says the boss. "But didn’t you notice last week There was a mistake. There was too much. Five pounds too much." "Yes, that’s right," says the man (He is very angry). "There was a mistake last week. For one mistak
A. once a month
B. twice a month
C. once a week
D. every five days