1、多选题：
The essential elements of research are（ ）.
选项：
A:skills
B:answers
C:questions
D:a systematic approach
答案: 【answers;
questions;
a systematic approach】

2、多选题：
The qualifying features of good questions can be illustrated by the following adjectives （ ）.
选项：
A:answerable
B:difficult
C:original
D:significant
答案: 【answerable;
original ;
significant】

3、判断题：
An original question does need to be totally new.（ ）
选项：
A:错
B:对
答案: 【错】

4、判断题：
No approach is perfect.（ ）
选项：
A:错
B:对
答案: 【对】

5、判断题：
If there is any alternative answer, the validity of study will be called into question.（ ）
选项：
A:对
B:错
答案: 【对】