According to the news, what is the main reason for Chinas rapid economic growth？
A. People"s living standard is rising.
B. The society is steady and secure.
C. Successful business investment.
D. Effective methods of constraining commercial banks" lending.
种母猪的繁殖性状的遗传力估计值较低，选种时一般以家系选择为好。()
How thd NASAs investigators prove the reason of thsaster？
A. By studying the video tape.
By analyzing the data concerned.
C. By anatomizing seven astronauts" body.
D. By making a simulated experiment.
繁育体系的好处是充分利用杂种优势，加快纯系的遗传进展。有利于控制种源。()
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