Aerospace breeding is an effective way to innovate germplasm resources. Compared with traditional breeding methods, it is characterized by ( ).

This question is about science and technology.

Space breeding, also known as space mutation breeding, is to send crop seeds or test tube seedlings to space, the use of space special, the ground can not be simulated environment (high vacuum, the universe of high-energy ion radiation, the universe of magnetic field, high clean) of mutation, so that the seed mutation, and then return to the ground to select and breed new seeds, new materials, cultivate new varieties of new crop breeding technology. Breeding in space is characterized by many beneficial mutations, large variation amplitude, fast stabilization, as well as high yield, high quality, early maturity, strong disease resistance, and so on. Its mutation frequency is 3-4 times higher than that of ordinary mutation breeding, and the breeding cycle is shortened by about one time compared with that of hybrid breeding, from about 8 years to about 4 years.

The correct answer is B.

This is the first time that a hybrid breeder has been used in a crossbreeding program.