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【单选题】

The students couldn't（）what the teacher was trying to explain.

A、grip

B、seize

C、grasp

D、snatch

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更多“The students couldn't（）what the teacher was trying to explain.”相关的问题
第1题
[单选题] You need to design a student registration database that contains several tables storing academic information. The STUDENTS table stores information about a student. The STUDENT_GRADES table stores information about the student's grades. Both of the tables have a column named STUDENT_ID. The STUDENT_ID column in the STUDENTS table is a primary key. You need to create a foreign key on the STUDENT_ID column of the STUDENT_GRADES table that points to the STUDENT_ID column of the STUDENTS table. Which statement creates the foreign key?（）

A、CREATE TABLE student_grades (student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk REFERENCES (student_id) FOREIGN KEY student (student_id));  B、CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id));  C、CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT FOREIGN KEY (student_id) REFERENCES student (student_id));  D、CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id));  

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第2题
[单选题] You need to design a student registration database that contains several tables storing academic information. The STUDENTS table stores information about a student. The STUDENT_GRADES table stores information about the student's grades. Both of the tables have a column named STUDENT_ID. The STUDENT_ID column in the STUDENTS table is a primary key. You need to create a foreign key on the STUDENT_ID column of the STUDENT_GRADES table that points to the STUDENT_ID column of the STUDENTS table. Which statement creates the foreign key?（）

A、CREATE TABLE student_grades (student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk REFERENCES (student_id) FOREIGN KEY student (student_id));  B、CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id));  C、CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT FOREIGN KEY (student_id) REFERENCES student (student_id));  D、CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id));  

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第3题
[判断题] “The student” in the sentence “The student liked the linguistic lecture.”，and “The linguistic lecture” in the sentence “The linguistic lecture liked the student.”belong to the same syntactic category.

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第4题
[判断题] “The student” in the sentence “The student liked the linguistic lecture”, and “The linguistic lecture” in the sentence “The linguistic lecture liked the student.” belong to the same syntactic category.

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第5题
[单选题] The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12) SEMESTER_END DATE GPA NUMBER(4,3) The registrar requested a report listing the students' grade point averages (GPA) sorted from highest grade point average to lowest. Which statement produces a report that displays the student ID and GPA in the sorted order requested by the registrar?（）

A、SELECT student_id, gpa FROM student_grades ORDER BY gpa ASC;  B、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa ASC;  C、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa;  D、SELECT student_id, gpa FROM student_grades ORDER BY gpa;  E、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa DESC;  F、SELECT student_id, gpa FROM student_grades ORDER BY gpa DESC;  

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第6题
[单选题] The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12) SEMESTER_END DATE GPA NUMBER(4,3) The registrar requested a report listing the students' grade point averages (GPA) sorted from highest grade point average to lowest. Which statement produces a report that displays the student ID and GPA in the sorted order requested by the registrar?（）

A、SELECT student_id, gpa FROM student_grades ORDER BY gpa ASC;  B、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa ASC;  C、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa;  D、SELECT student_id, gpa FROM student_grades ORDER BY gpa;  E、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa DESC;  F、SELECT student_id, gpa FROM student_grades ORDER BY gpa DESC;  

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第7题
[单选题] The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12) SEMESTER_END DATE GPA NUMBER(4,3) The registrar requested a report listing the students' grade point averages (GPA) sorted from highest grade point average to lowest. Which statement produces a report that displays the student ID and GPA in the sorted order requested by the registrar? （）

A、SELECT student_id, gpa FROM student_grades ORDER BY gpa ASC;  B、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa ASC;  C、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa;  D、SELECT student_id, gpa FROM student_grades ORDER BY gpa;  E、SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa DESC;  F、SELECT student_id, gpa FROM student_grades ORDER BY gpa DESC;  

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第8题
[单选题] You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.Which statement accomplishes this task?（）

A、ALTER TABLE students ADD PRIMARY KEY student_id;  B、ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student _ id);  C、ALTER TABLE students ADD CONSTRAINT stud _ id _pk PRIMARY KEY (student _ id);  D、ALTER TABLE students MODIFY CONSTRAINT stud _ id _pk PRIMARY KEY (student _ id);  

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第9题
[单选题] You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty. Which statement accomplishes this task?（）

A、ALTER TABLE students ADD PRIMARY KEY student_id;  B、ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);  C、ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;  D、ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);  E、ALTER TABLE students MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);  

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