单选题There are eight tips in Dr. Roger's lecture on sleep, and one of them is: ______ to bed early unless you think it is necessary.

单选题Color-b1ind people often find it difficult to ___ between blue and green.

单选题(While walking) on a sunny day, (far from) the city crowds, the mountains give him (a sense of) (infinite) peace.A. While walking B. far from C. a sense of D. infinite

单选题Is there enough oil beneath the Arctic National Wildlife Refuge (保护区) (ANWR) to help secure America"s energy future? President Obama certainly thinks so. He has argued that tapping ANWR"s oil would help ease California"s electricity crisis and increase the country"s energy independence, thus reducing its oil reliance on other countries. But no one knows for sure how much Crude oil lies buried beneath the frozen earth. The oil industry goes with the high end of the range, which could equal as much as 10% of U.S. consumption for as long as six years. By pumping more than 1 million barrels a day from the reserve for the next two or three decades, lobbyists claim, the nation could cut back on imports equivalent to (等于) all shipments to the U.S. from Saudi Arabia. An oil increase would also mean a multi billion-dollar windfall (意外之财) in tax revenues, royalties (开采权使用费) and leasing fees for Alaska and the Federal Government. Best of all, advocates of drilling say, damage to the environment would be insignificant." We"ve never had. a document case of oil rig chasing deer out onto the pack ice," says Alaska State Representative Scott Ogan. Not so fast, say environmentalists. The National Resources Defense Council says there may be no more than 3.2 billion barrels of oil in the coastal plain of ANWR, a drop in the bucket that would do virtually nothing to ease America"s energy problems. And consumers would wait up to a decade to gain any benefits, because drilling could begin only after much bargaining. As for ANWR"s impact on the California power crisis, environmentalists point out that oil is responsible for only 1% of the Golden State"s electricity output and just 3% of the nation"s.

单选题The fiat where we live ______ three rooms only.

单选题He offered to ______ her a hand as the bag was too heavy for her to carry. A. lend B. help C. show D. borrow

单选题Greg: Hi, Karen. I have tickets to a concert at Carnegie Hall. It starts at 8:00. Karen: Hmmm... ______

单选题Doctor: How is your backache? Is it still bothering you? Patient: ________. Now I can’t move.

单选题Speaker A: Do you mind if I keep pets in this building? Speaker B: ______

单选题A country must always be ________ guard against spies and invaders.

单选题The chemistry class ______ for five minutes when we hurried there. A. had been on B. was on C. has been on D. would be on

单选题Earthquake is a shaking of the ground caused by the sudden breaking and the shifting of large sections of the earth's rocky outer shell. Earthquakes are among the most powerful events on earth, and their results can be terrifying. A severe earthquake may release energy 10,000 times as great as that of the first atomic bomb. Rock movements during an earthquake can make rivers change their courses. Earthquakes can trigger landslides that cause great damage and loss of life. Large earthquakes beneath the ocean can create a series of huge, destructive waves called tsunamis that flood coasts for many miles. Earthquakes almost never kill people directly. Instead, many deaths and injuries in earthquakes result from falling objects and the collapse of buildings, bridges, and other structures. Fire resulting from broken gas or power lines is another major danger during a quake. Spills of hazardous chemicals are also a concern during an earthquake. (77) The force of an earthquake depends on how much rock breaks and how far it shifts. Powerful earthquakes can shake firm ground violently for great distances. During minor earthquakes, the vibration may be no greater than the vibration caused by a passing truck. On average, a powerful earthquake occurs less than once every two years. At least 40 moderate earthquakes cause damage somewhere in the world each year. About 40,000 to 50,000 small earthquakes--large enough to be felt but not damaging-----occur annually.

单选题He passed the examination ______ the satisfaction of his parents.

单选题Selfish people often take ______ of other people"s kindness.

单选题His _____ novel is more interesting than any other novels he’s ever written.

单选题I don"t think it is any use ______ this matter any further.

单选题The key ______ success is hard work and persistence.

单选题—Will you be able to finish your report today? —______A. I like itB. I hope soC. I'll do soD. I'd love it