题目内容：

    Dr Robert Hutchings Goddard is regarded as the father of modern rocket propulsion(推进）。As a physicist of great insight,Goddard also had his unique gift for invention.It was in honor of this brilliant scientist that NASA's Goddard Space Flight Center in Greenbelt,Maryland,was set up on May 1,1959.

Goddard first obtained public notice in 1907 in a cloud of smoke from a powder rocket fired in, the basement of the Worcester Polytechnic Institute's physics building.School officials took an immediate interest in the work of the student Goddard. The school's administration,to his surprise,did not expel him.He thus began his lifetime of fine work.

In 1914,Goddard received two U.S.patents.One was for a rocket using liquid fuel.The other was for a two-or three-stage rocket using solid fuel.

By 1926,Goddard had constructed and successfully tested the first rocket using liquid fuel. At that time,Goddard' s rockets left little impression on government officials.Only through modest amount of money from the Smithsonian Institution and the Daniel Guggenheim Foundation was Goddard able to sustain his devoted research and testing.

Goddard' s greatest engineering contributions were made during his work in the 1920s and 1930s.He received a total of $10,000 from the Smithsonian by 1927,and through the personal efforts of Charles A.Lindbergh,he later received financial support from the Daniel and Florence Guggenheim Foundation.

Goddard 's work largely anticipated the later German V-2 missiles in technical detail.His rocket flight in 1929 carried the first scientific payload(有效负荷），a barometer(气压计）and a camera.During World War II,Goddard was appointed by the U.S.Navy to the development of practical jet-assisted takeoff and liquid propellant(推进燃料）rocket motors capable of variable thrust.In both areas,he was successful.Robert H.Goddard died on August 10,1945,four days after the first atomic bomb was dropped on Japan.

1.What was NASA's Goddard Space Flight Center in Greenbelt established for?

A.To attract people's attention.

B.To make Goddard famous.

C.To show respect to Goddard.

D.To introduce Goddard 's invention.

2.According to Paragraph 2,how did the school officials respond to what Goddard did in the physics building in 1907?

A.They wanted to know more about it.

B.They were disappointed at it.

C.They made him drop out of school.

D.They ordered him to stop it.

3.What does the underlined word"sustain"in the fourth paragraph mean?

A.Delay. B.Reduce.

C.Create. D.Continue.

4.When probably was Goddard chosen to work to develop practical jet-assisted takeoff?

A.In 1927. B.In 1929.

C.In 1940. D.In 1946.