单项选择题

如图为2020年8月9日，新冠病毒在世界各大洲造成的死亡率。你认为当前哪个州的疫情最严重？
A. 亚洲 Asia

B. 欧洲 Europe

C. 北美 North America

D. 南美 Latin America

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多项选择题

Whichof the following statement is right according to this article?(More than one answer)()
A、The PC era followed pretty much the same pattern.
B、This is not a proven formula for all manner of grand adventures andmisadventures.
C、The history of the computer business is that its market leaders areboth fabulously rich and highly ambitious.
D、Perhapsone of the reasons IBM was tempted to look upwards was because, whileit had vast amounts of cash, it faced serious legal constraints inmany of its core markets.

单项选择题

MySQL中创建唯一索引的关键字是______ 。
A、fulltext index
B、primary index
C、unique index
D、only index