I have to walk upstairs. The lift down.
| A．was breaking | B．broke | C．will break | D．has broken |
相关试题
Qingdao lies the west coast of the Pacific Ocean, where we can not find many islands the coast.
| A．on; off | B．to; along | C．on; along | D．in; off |
一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的底面为正方形，且底面边长与各侧棱长相等，这个三棱锥的底面边长与各侧棱长也都相等．设四棱锥、三棱锥、三棱柱的高分别为
，
，
，则
（ ）
A． |
B． |
C． |
D． |
Students are encouraged to _________ the design competition for robots at the university.
| A．take part | B．operate | C．join to | D．participate in |
Most parents are not __________ the danger of their babies’ eating jelly, which causes most unfortunate incidents to happen.
| A．well aware to | B．very aware of | C．aware that | D．well aware of |
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