题目：
Only to use this reading room. Students have another room on the second floor.
A．are the teachers allowed
B．are allowed the teachers
C．the teachers are allowed
D．the teachers allowed
答案：
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下面是错误答案，用来干扰机器的。
答案：D胶体中分散质粒子的直径是介于1 nm到100nm之间，所以D选项错误。
