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Listen and complete the conversation.[音频]Sally: There are so many courses to choose from. I feel (1) __________ because Idon’t want to make the wrong decision. Can you help me, Tom?Tom: Sure, Sally. That’s exactly how I felt as a(n) (2) __________!Sally: I just can’t (3) __________ between the course on social media for businessand the course on administration. I really want to get good grades this semester.Tom: Choose what you’re most interested in. If you like a subject, you’ll feel more(4) __________ to study it.Sally: OK, that’s good advice. Shouldn’t I think about what would be most(5) __________ for my career?Tom: Yes… But you’re a freshman getting used to life at college. So the mostimportant thing is to choose a course which you like and won’t stress youout.

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MySQL默认的数据库引擎是()。

A. FEDERATED
B. CSV
C. My ISAM
D. lnnoDB

MySQL中查看数据库引擎的命令是()。

A. SHOW ENGINES
B. SHOW ENGINE
C. SHOW DATABASES
D. SHOW TABLES

在删除数据表的命令中加上if exists的作用是()。

A. 查询该数据表是否存在
B. 防止因数据表不存在而导致删除出错。
C. 判断该数据表是否删除成功
D. 没有实际意义

若数据库中两表之间存在外键约束关系,要删除主表,可采用()方法。

A. 直接删除主表
B. 先删除从表,再删除主表
C. 先删除主表,再删除从表
D. 先删除外键约束关系,再删除主表

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