政府在不特别指明或事先承诺汇率目标的情况下，通过积极干预外汇市场来影响汇率变动。这种汇率制度是（）。
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The Columbia University researehers are the first to use sea—surface temperatures
A. Right
B. Wrong
C. Not mentioned
He is assigned to oversee（A级）the production 0f the assembly lines．
A. supervise
B. watch
C. suspect
D. predict
Two major problems for museums are that they have too many visitors and they__________．
A. have higher demands of museums
B. are open to move people with different social background
C. to lengthen their opening hours
D. charge too little for admission
E. have been built and open to public
F. by lowing the admission fees
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