Neurogenic tumors are most likely to locate in____（）
A. posterior mediastinum
B. upper anterior mediastinum
C. Anterior mediastinum
D. upper middle region of middle mediastinum
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The thyroid behind the sternum tends to occur in_（）
A. upper anterior mediastinum
B. middle anterior mediastinum
C. upper middle region of middle mediastinum
D. lower middle mediastinum
为choose表添加外键约束，约束名为choose_student_fk，外键为student_no，连接到 student表的stuednt_no字段，以下命令正确的是_（）
A. alter table choose add constraint choosestudent_fk FOREIGN KEY （student_no）
B. alter table choose add constraint choose_student_fk FOREIGN KEY （student_no） REFERENCES student（stuednt_no）
C. alter table choose add constraint choose_student_fk FOREIGN KEY （student_no） REFERENCES student;
D. alter table choose add constraint choose_student_fk REFERENCES student（stuednt_no）
If the students break the school rules, they will be put in detention（）
A. kept in prison
B. kept in school after class
C. sent home
D. kept in a black room
With two exams
______, I have to work really hard this weekend（）With two exams
______, I have to work really hard this weekend（）
A. worry about
B. to worry about
C. worried
D. about
E. D．worrying about
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