—What did she______?

—She said she ______to Beijing for a trip.

A．said; will go

B．say; was go

C．say; was going

D．said; was going

请根据所学生物学知识回答有关问题：

(1)使用显微镜观察细胞，由低倍镜转换成高倍镜时，视野的亮度变_____，视野中细胞的数目变____；如果物像偏左上方，应该向____方移动玻片标本，将物像移到视野中央。

(2)用显微镜观察小鱼尾鳍内血的流动，请回答：在视野中，血液流速最快的血管是_____；红细胞只能单行通过的血管是_______。