What do those soccer players usually do _____ Sunday mornings? [ ]
A. in
B. on
C. at
答案:B
All this ___ that knowledge comes from practice.
A.speaks
B.proves
C.explains for
D.teaches
安全带的挂钩或绳子应挂在结实牢固的构件上,或专为挂安全带用的钢丝绳上,并应采用()的方式