What poses the biggest threat to the data stored on CDs and DVDs?
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【简答题】听力原文: In its most extreme form, poverty is a lack of basic human needs, such as adequate and nutritious food, clothing, housing, clean water, and health services./Extreme poverty can cause terrible su...
【单选题】Each of the following sentences contains ONE mistake. Find it out and correct it. Jack was washing dishes then Mary knocked at the door and entered.
A.
Jack was washing dishes as Mary knocked at the door and entered.
B.
Jack was washing dishes while Mary knocked at the door and entered.
C.
Jack was washing dishes when Mary knocked at the door and entered.
D.
Jack was washing dishes as soon as Mary knocked at the door and entered.