For years, U. S. automakers have fough...

单项选择题For years, U. S. automakers have fought tougher regulations by arguing that Americans tend to prefer larger, gas-guzzling SUVs and trucks. That’s not always true: when gas prices were at an all-time high last summer, sales of SUVs were down considerably, while hybrids flew off dealer lots. Since then, prices at the pump have dropped-and so has the appetite for small cars. As long as the price of gas remains volatile(易变的, 动荡不定的), it’s far from certain that Americans will buy the more efficient cars and trucks the new standards will require automakers to produce. In the long run, though, a gas tax that puts a floor on fuel prices may be the only way to break America’s SUV addiction. But Obama has said he’s not interested. "You need a price signal. Regulations alone won’t do it," says Lester Lave, director of the Carnegie Mellon Green Design Initiative.
Americans’ appetite for SUVs dropped when

A. gas prices hit new high last summer.
B. hybrids were out of stock last summer.
C. the government set limits on fuel price last summer.
D. the gas price remained fluctuing last summer.

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1.单项选择题During Mir’s lifetime, Russia spent about US $4.2 billion to build and maintain the station.
The Soviet Union launched Mir, which was designed to last from three to five years, on February 20,1986, and housed 104 astronauts over 12 years and seven months, most of whom were not Russian. In fact, it became the first intemational space station by playing host to 62 people from 11 countries. From 1995 through 1998, seven astronauts from the United States took turns living on Mir for up to six months each. They were among the 37 Americans who visited the station during nine stopovers by space shuffles.
______ Americans ever visited Mir during its lifetime.

A. 62
B. 37
C. 11
D. Seven

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