"So if all of a sudden，we saw that the deep part of the fault was slipping a huge amount，it might be an indication that there was an increased chance of having an earthquake come at the shallower part of the fault，" he said.

1.What causes tremors and quakes according to the passage?

A.The formation of the Earth，Sun and Moon.

B.The change of the sea levels of Earth.

C.The effect of the gravitational tug of sun and moon on Earth's crust.

D.The movement of creeping in the deep part of the San Andreas Fault.

2.The underlined word "they" in Paragraph 6 refers to .

A.the researchers

B.the tidal forces

C.the low­frequency earthquakes

D.the typical earthquakes

3.Low­frequency earthquakes occur when .

A.the tides are getting bigger gradually

B.the sun and moon are in a straight line

C.the sun and moon are 90 degrees apart

D.the San Andreas Fault moves slowly

4.According to Shelly，the most important function of the study is .

A.to find out where the typical earthquakes occur

B.to indicate when the regular earthquakes occur

C.to uncover how low­frequency earthquakes occur

D.to offer more information about the deeper part of the fault

　　Michael Herr，who has died aged 76，was the author of Dispatches(1977)，the best book about the Vietnam war.Herr also made vital contributions to two of the best films on the war，Apocalypse Now and Full Metal Jacket.

　　It took Herr eight years to write Dispatches，in part because he went home from Saigon with a bad case of stress disorder. He had gone to Vietnam as a correspondent for Esquire magazine.An American general asked him whether he was there to write about military fashion，and another whether he was there to write humour. No，he told them. He wrote little for Esquire，but took advantage of the US government's decision to allow correspondents extraordinary access to go to war with the soldiers. He shared their discomforts and their fears，witnessed their death and recorded their language.

His own language，a stream of consciousness pulsing with energy，but masterfully controlled，captured the fear and the horror，but also the excitement，of the war in the jungle and paddy