Although he is one of China's most famous scientists，Yuan Longping considers himself a farmer，for he works the land to do his research.In fact，his sunburnt face and arms and his slim，strong body are just like those of millions of Chinese farmers，for whom he has struggled for the past five decades.Yuan Longping grows super hybrid（雜交）rice.In 1973，he became the first agricultural pioneer（農(nóng)業(yè)先鋒）in the world to grow the super hybrid rice that has a high output.This special strain of rice makes it possible to produce 20% more of the crop in the same fields.Now more than 60% of the rice is from this hybrid strain.
   Born in 1930，Yuan Longping graduated from Southwest Agricultural College in 1953.Since then，finding ways to produce more rice has been his life goal.As a young man，he saw the great need for increasing the rice output.At that time，hunger was a problem in many parts of China.Yuan Longping looked for a way to increase rice output without expanding the area of the fields.In 1950，Chinese farmers could produce about 56 million tons of rice，but now nearly 200 million tons per year.Nearly 22% of the world's people are fed from just 7% of the farmland in the world，which is due to the super hybrid rice grown by Yuan Longping.
（1）What is Yuan Longping？

B

B

A.He is an artist.
B.He is a scientist.
C.He is a doctor.
D.He is a teacher.
（2）What does the underlined words "five decades" mean in paragraph one？

D

D

A.Fifty million years.
B.Fifty thousand years.
C.Fifty hundred years.
D.Fifty years.
（3）In 1973，what happened to Yuan Longping？

B

B

A He was born.
B.He grew the super hybrid rice as the first agricultural pioneer.
C.He graduated from the college.
D.He produced 56 million tons of rice.
（4）How many tons of rice can Chinese farmers produce per year now？

C

C

A.Nearly 50 million tons.
B.Nearly 100 million tons.
C.Nearly 200 million tons.
D.Nearly 250 million tons.