What does the writer think is the best way to improve one's vocabulary？
A. To learn common roots of words.
B. To study how Latin becomes Greek.
C. To recognize Latin words.
D. To remember Greek roots.
查看答案
If a grandma is willing to look after her grandkids, she should be ______.
A. encouraged
B. kept at home
C. given breaks
D. paid
听力原文：M: Is this the Eastern Airline check-in？
W: Yes. Can I see your ticket, please？
Where does the conversation probably take place？
At the bus station.
B. At a train.
C. At the airport.
【B19】
A. as
B. next time
C. since
D. so long as
如果r和t都大于0，现值利率因子PVIF(r，t)永远都大于0。()
A. 正确
B. 错误
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