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什么是生物技术下游加工过程？

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At that time, she（）on a journey with her friend

A. is
B. was
C. has been
D. is being

出血性脑卒中CT扫描示出血区出现低密度影。

A. 正确
B. 错误

看完电视后，可以用湿冷抹布擦拭后盖及荧光屏

A. 正确
B. 错误

At the（）of the police, those people ran off in all directions.

A. sight
B. look
C. watch
D. view