—I did very well in the English exam last week.  —I did _________. I got a full mark.

A．no better

B．not better

C．no worse

D．even worse

改良Neubauer计数室的结构特点，正确的叙述是

A．每个计数室的边长均为9mm
B．每个大方格的长宽均为1mm
C．每个计数室被划分成16个大方格
D．每个计数室四角上的四个大方格用单线划成16个方格
E．每个计数室的中央大方格用单线划成25个中方格