二维点过滤有三种可能的选择，三维点过滤有（）可能的选择A.四种_爱下问搜题

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问题单项选择题

二维点过滤有三种可能的选择，三维点过滤有（）可能的选择

A.四种

B.五种

C.三种

D.六种

答案

参考答案：D

填空题

用方框中词组的适当形式填空。

at an end, dig out, right away, think little of, be trapped in

1. He returned to his country after the war was ______.
2. Don't worry! You'll get the ticket ______.
3. She is such a selfish woman that I ______ her.
4. They _____ the burning building. Let's go to rescue them.
5. Much to our relief, more than a dozen people were ______
______ of the ruins alive.

选择题

— I'm sure Andrew will come out first in this gymnastic competition.

— I think so. He ________ for it for months.[ ]

A. is preparing

B. was preparing

C. had been preparing

D. has been preparing