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          All early television was broadcast in black and white. Color television was possible, but it was too (26)expensive and of very (27)poor quality until the middle 
of the 1950s. Color television broadcasts began in the United States in 1954, in Japan in 1960, and in Europe in 1967. 
         The first (28)landing on the moon was broadcast (29)live on television in 
1969, and now television programs are (30)transmitted all over the world immediately through the (31)use of satellites that transmit the signals from, the earth, through space, 
and back to the earth. 
            More people now get their news and information through television than 
through newspapers and (32)radio. The development of television is (33)one of the most rapid and exciting events of our century.

Cho bộ NST ở Ngô (2n=78).Hỏi ở kì giữa, kì sau của nguyên phân số lượng nst, cromatit, tâm động là bao nhiêu?

He is good at English , ___________?

A. is he                      B. isn’t he             C. wasn’t he            D.doesn’t he