1.【填句补文】Mexico's current lack of funds is also partly due to oil. The country has rich oil fields and a few years ago, when oil was expensive, Mexico was selling large quantities of oil to the USA and earning a lot of money. ________. However, the price of oil then dropped, and Mexico has been left owing enormous sums of money and with not enough income from oil sales to pay back the loans.
A.But those ruins are in danger of being seriously damaged by pollution.
B.Scientists estimate that about one millimeter of stone is worn away every twelve years.
C.At others the painted surfaces inside temples are lifting and flaking off and the stone is being eaten away.
D.The government was therefore able to borrow huge sums of money from banks around the world, thinking they would have no problem repaying their debts.
2.【填句补文】More and more Americans are living alone. Some live alone because of divorce or the death of a partner. ________. According to a recent U.S. census (人口普查), 25 percent of all households in the U.S. are made up of just one person.
A.It seems that many grown-ups today are realizing that childhood dream.
B.He says, “I like being by myself.”
C.However, even more people are living alone because they have chosen to.
D.There’s more pressure to get married nowadays.
3.【填句补文】The weather of the Caribbean Sea is almost always warm and sunny.Sandy beaches line the coasts of many islands. ________. Many tourists arrive on cruise ships.
A.They are Cuba，Puerto Rico，Jamaica，and Hispaniola.
B.The Caribbean Islands are known by several names.
C.Some of these islands are no more than tiny slivers(小片)of exposed coral.
D.This is why millions of tourists visit the islands each year.
4.【填句补文】Five-year-old Lani still takes seven medicines with her breakfast every morning. "She’s very good about it," says her father David. Lani is alive today because of her father David, in more than one way; when she was one year old she received part of her father’s liver in a liver—transplant operation. Lani was born with a liver illness. ________. Doctors advised that a transplant was the only way in which she would live.
A.She had one operation when she was six weeks old, which was not successful.
B.David quickly recovered from the operation.
C.David was finally able to ride his bike again after about a year.
D.Doctors hope that she will continue to get stronger and stronger.
5.【填句补文】Some 20，000 tons of antibiotics are used in the European Union and the US each year. More than half are give to farm-animals to prevent disease and promote growth. ________.
A.The warning comes from a researcher in Switzerland who looked at levels of the drugs in farm slurry.
B.The drugs could be getting into our food and water.
C.Many drugs given to humans are also excreted unchanged.
D.But recent research has found a direct link between the increased use of these farmyard drugs and the appearance of antibiotic-resistant bugs that infect people.