（1）When did Qian Xuesen return to China？
A.In 1949.
B.In 1950.
C.In 1955.
（2）What do people think of Qian Xuesem？
A.The father of China's hybrid rice.
B.The father of China's space program.
C.The father of China's high-speed train.
（3）How long was Qian in prison before he returned？
A.Four years.
B.Five years.
C.Six years.
（4）Who helped his team in the 1950s？
A.Scientists from the USA.
B.Great pioneers in China.
C.Nobody.
（5）Why did Qian and his team work so hard？
A.To beat our enemies.
B.To go to Mar s one day.
C.To make our country safer.