What remains a great concern for space scientists?
A.The availability of water on the moon.
B.The cloud of vapor on the moon
C.The rockets crashing into the lunar surface.
D.The techniques of sending the spacecraft to the moon.

Which of the following is NOT True about NASA in 1960s?
A.It is an American agency.
B.It conducted research on space and space exploration.
C.It invented circuits.
D.It used a large number of circuits.

What is considered the biggest contribution of the Apollo moon landings?
A.They had important influence on technological advance.
B.They initiated research on computer.
C.They helped invent the integrated circuit.
D.They collected a wide range of soil and rock samples.

What can be inferred about the difference between the first and the second moon landing?
A.In the second one, astronauts did not collect lunar rocks.
B.In the first one, astronauts stayed longer on the moon.
C.The first one demonstrated scientific advancement.
D.The second one was not a great achievement in itself.

The author says that the scientists found the discovery of household cat skeleton __________ .
A.handled with care
B.interesting
C.nothing new
D.meaningless

According to the passage, if the bones had not been buricd right after the cat died, _______.
A.they would have been put in the right place in the skeleton
B.other animals would have taken them away
C.the animals would have been tamed
D.they would have been placed in dog graves

The discovery of the cat grave suggests that_____ .
A.the cat buried were wild ones
B.cats were butchered for food
C.there was a special connection between cats and humans
D.cats didn’t related to humans

Things found in the grave of the villager are _______ .
A.cat bones
B.items other than jewelry and seashell
C.jewelry and seashell
D.jewelry, seashell and other stuff

Wild cats are thought to live by eating ______ .
A.food supplied by humans
B.rats and mice
C.food supplied for mice
D.bones

The picture...... I bought was very valuable.
A.who
B.whom
C.which
D.whose