The sunspot came into its active stage last year, that happens once every eleven years.
| A．one | B．it | C．the one | D．what |
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The boys, with this frightening person, lost their tongues.
| A．to face | B．having faced | C．faced | D．facing |
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 |
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