Complete the following sentence by choosing the most formal word from the choices."The scientists asked 200 passersby to estimate the angle of a set of stairs, and another 200 to do the same for an escalator—which, of course, requires no effort to __________."
选项:
A:go up
B:rise
C:climb
D:ascend
发布时间:2024-06-04 09:19:35