单选题
According to the passage, student researchers may have to change their research projects because
A、
their budgets are too high
B、
their original questions are too broad
C、
their teachers do not give adequate advice
D、
their time is very limited
【正确答案】
B
【答案解析】
文中提到学生做研究时总以a general question开始，但后来却find themselves forced to narrow its focus，可见是问题比较宽泛，必须缩小范围。
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