D．uring the past two decades，research has______our knowledge of daydreaming.

A．expanded

B．emerged

C．descended

D．conquered

[单选题]Without question, people’s lives in China have improved dramatically in the

[单选题]Over the past decades, sea icein the Arctic as a result of global warming.A． . haddecreased Bdecreased C has been decreasingD is decreasing

[单选题]Mr. Joe has worked very hard in the past two years and has paid all his deb

[单选题]Over the past two days, Lorraine Quigley, CFA, manager of a hedge fund, has

[单选题]Text 3D．uring the past generation， the American middle-class family that once could count on hard work and fair play to keep itself financially secure has been transformed by economic risk and new realities. Now a pink slip， a bad diagnosis. or a dis

[单选题]Acme Corp. has reported the following financial ratios for the past two yea

[试题]It has been documented that during World War Ⅱ, America's armed forces once tried formation flight to save fuel.

[单选题]Over the past 20 years, the Internet has helped change our world in way or another for the better.A． anyB. one C. everyD. either

[单选题]Text 2For more than two decades, U.S. courts have been limiting affirmative-action programs in universities and other areas. The legal rationale is that racial preferences are unconstitutional, even those intended to compensate for racism or intolera

[单选题]根据下列文章，回答31～35题。D．uring the past generation， the American middle-class family that once could count on hard work and fair play to keep itself financially secure has been transformed by economic risk and new realities. Now a pink slip， a bad diagnosis