In 1948,three American scientists invented __________ transistor, which is __________ small electronic device to control an electric current.
A.the; a | B.a; a |
C.the; the | D.a; the |
125. Such a cold day was_________in October in Shenzhen.
A.unusual | B.seldom | C.never | D.Uncommon |
124. He had an________holiday in Hong Kong, for he got his pocket picked on the first day.
A.pleasing | B.unfortunate | C.unfit | D.Unpleasant |
123. At present nanotechnology(纳米技术), a kind of tip science_________to the common people. Few people know him.
A.unknowing | B.unknown | C.known | D.Untrue |
122. The children are very fat butbecause they appear ill-nutritious(营养不良)。
A.unhealth | B.unhealthy | C.healthy | D.Health |
121. I was uncertain of my success. Which of the following can replace the underlined word?
A.willing | B.not sure | C.certainly | D.not certainly |