[填空题]This ______ (discover) of diamond came at time when there was a big demand.

[填空题]This（）(discover) of diamond came at time when there was a big demand.

[单项选择]

Passage 2
It came as something of a surprise when Diana, Princess of Wales, made a trip to Angola in 1997, to support the Red Cross’s campaign for a total ban on all anti-personnel landmines. Within hours of arriving in Angola, television screens around the world were filled with images of her comforting victims injured in explosions caused by landmines. "I knew the statistics," she said, "But putting a face to those figures brought the reality home to me; like when I met Sandra, a 13-year-old girl who had lost her leg, and people like her."
The Princess concluded with a simple message: "We must stop landmines". And she used every opportunity during her visit to repeat this message.
But, back in London, her views were not shared by some members of the British government, which refused to support a ban on these weapons. Angry politicians launched an attack on the Princess in the press. They described her
A. to voice her support for a total ban of landmines
B. to clarify the British government’s stand on landmines
C. to investigate the sufferings of landmine victims there
D. to establish her image as a friend of landmine victims

[简答题]The recession came at the best time that it could because it has given the US a chance to make permanent adjustments to the government’s economic and regulatory policies and has offered businesses and individuals the opportunity to change decades-old habits. It has also allowed the nation to look at its place in the world, especially its best options to compete with China and other emerging countries, in a way that would have been forestalled (阻止，阻碍) if the recession had not happened in 2008 and 2009.
The cause of the recession is often blamed on financial firms that took astonishingly large risks with the goal of multiplying their earnings at unprecedented levels and consumers who were willing to aggressively borrow against inflated home values that were not sustainable. Government policies might have prevented this if regulators could have looked ahead in 2005 and seen the danger in financial firms trading in exotic financial instruments and offering homeowners loans based on ra

[填空题]The TIME reporters came up with so many interesting stories about pets because the pet owners wanted to share their stories.

[单项选择]The human species came into being at the time of the greatest biological diversity in the history of the Earth. Today, as human populations expand and alter the natural environment, they are reducing biological diversity to its lowest level. The ultimate consequences of this biological reduction are beyond calculation, but they are certain to be harmful. That, in essence, is the biodiversity crisis.
The history of global diversity can be summarized as follows: after the initial flowering of multi-cellular animals, there was a swift rise in the number of species in early Paleozoic times (between 600 and 430 million years ago), then plate-alike stagnation for the remaining 200 million years of the Paleozoic era, and finally a slow but steady climb through the Mesozoic and Cenozoic eras to diversity’s all-time high. This history suggests that biological diversity was hard won and a long time in coming. Furthermore, this pattern of increase was set back by five massive extinction epis
A. The reduction in biodiversity represents a setback both for science and for society as a whole.
B. The material and cultural wealth Of a nation are insignificant when compared with the country’s biological wealth.
C. The human species is in the process of initiating an unprecedented massive extinction episode.
D. The current decline in species diversity has potentially grave consequences for the human species.

[单项选择]He came back late, （　） which time all the guests had already left.
A. after
B. by
C. at
D. during

[单项选择]He came back late,（） which time all the guests had already left.
A. after
B. by
C. at
D. during

[单项选择]Passage Five