题目内容
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[单选题]
How long ______ the book be kept？ For two weeks, but you ______ return it on time.
A.can; may
B.may; need
C.can; must
D.must; need
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.can; may
B.may; need
C.can; must
D.must; need
如果结果不匹配，请 联系老师 获取答案
更多“How long ______ the book be ke…”相关的问题
A.How far
B.How long
C.How many
D.How soon
A.So you are here finally
B.Did you have a good trip
C.You must have had a tiring journey
D.How long did it take you to get here
If you feel a shortage of energy, join our Health Club. Fatigue is common for people to 1）_________ of to their doctors. In such cases, you should take a look at the causes for your tiredness and learn how you can get rid of it. Firstly, if you have to work hard 24 hours a day, seven days a week with high 2)_________, you will feel tired and bored. The 24/7 push to be productive can wear you out both physically and 3)__________. Your can have mini-breaks that will cheer you up and make your routine a little less routine. Secondly, if you sit staring at a screen for long periods of time you tend to blink less frequently and 4)_______your eyes. Your eyes need a break. Stand up once in a while to 5)_________ your legs and arms. Frequent breaks with long 6)__________ to your nearby parks will keep your body active and reduce eyestrain. Finally, gaining as little as five pounds of weight can cause 7)________. Extra weight also puts extra burden on your heart, which makes you tired. You can 8)_________ the habit of eating junk food and 9)___________ yourself to the basics of healthy eating. Try to eat smaller 10)_________ of food. With each pound of weight you lose, you'll feel a rise in energy. A) reverse B) strip C) strain D) empty E) portions F) fatigue G) rides H) emotionally I) reserve J) stretch K) dump L) complain M) collections N) efficiency O) strides
(1)企业目前的产量为100单位，成本最小化的劳动和资本分别为20和5。在图上用等产量线和等成本线表示出来。
(2)企业想将产量扩大为140单位，如果资本在短期固定，需要多少劳动？在图形上表示出来，并计算企业新的成本。
(3)在图形上表示出企业在长期生产140单位产品的成本最小化劳动和资本投入。
(4)如果边际技术替代率为K/L,计算生产140单位产品的最优劳动和资本投入。
Suppose that a firm' s production is q= 10L1/2K1/2. The cost of a unit of labor is $ 20 and the cost of a unit of capital is $ 80. a The firm is currently production 100 unis of output and has determined that the cost - mini-mizing quantities of labor and capital are 20 and 5, respectively. Graphically illustrate this using isoquants and isocost lines.
b，The firm now wants to increase output to 140 units. If capital is fixed in the short run, how much labor will the firm require？ Illustrator this graphically and find the firms new total cost.
c. Graphically identify the cost - minimizing level of capital and labor in the long run if the firm wants to produce 140 units.
d. If the marginal rate of technical substitution is K/L, find the optimal level of capital and labor required to produce the 140 units of output.
About half the ____ (long) of the Great
Wall, Route 66 is America's original cross-
country highway.
it _____________ enough to eat.
A) mild B) slight
C) light D) tender
