E．very few years, the coal workers ______ their lungs X-rayed to ensure their health.

A． are having

B． have

C． have had

D． had had

[单选题]During the last few years，it has been realized that maintenance of programs is more expensive than development,so reading of programs by humans is as important as (73) them.(73) A．editingB．writedC．writtenD．writing

[单选题]D．A． few years ago, Paul Gerner began to gather a group of architects in Las Vegas to ask them what it would take to design a public school that used 50 percent less energy, cost much less to build and obviously improved student learning. “I think ha

[单选题]D．uring the last few years ,it has been realized that maintenance of programs is more expensive than development, so reading of programs by humans is as important as(73)them.A．editingB．writedC．writtenD．writing

[单选题]D．uring the last few years, it has been realized that maintenance of programs is more expensive than development, so reading of programs by humans is as important as(67)them.A．editingB．writedC．writtenD．writing

[单选题]C．A． few years ago I had an “aha!” moment regarding handwriting.I had in my hand a sheet of paper with handwritten instructions on it for some sort of editorial task. It occurred at first that I did not recognize the handwriting，and then I realized w

[单选题]The air in Beijing is getting much _____ now than a few years ago.A.clean B

[问答题]Fewer high school students are smoking now than a few years ago.

[单选题]Over the past few years, the companies in an industry have experienced posi

[问答题]The Olympic Games is an international sports event thattakes place every fo

[问答题]The Olympic Games is an international sports event that takes place every f