Nowadays, almost every action we take ______ a digital trail.（ ）

A . obtainable B . equitable C . profitable D . approvable

A . by raft B . by cruise ship C . by a ship D . by aboat

A . Diesel engines have more advantages in comparison with gasoline engines B . Diesel engines have more advantages in comparison to gasoline engines C . Gasoline engines have more advantages in comparison with diesel engines D . Gasoline engines have more advantages in comparison to diesel engine

A . Negligence B . Barratry C . Piracy D . Mutiny

A .  enables automated threat response B .  enables noncompliant device access C .  enables endpoint posture enforcement D .  enables third-party client and server protocol

A．Moving away. B．Calling for help. C．Climbing up a tree. D．Remaining with its group.

People living in Bakersfield, for instance, can visit the Pacific Ocean and the coastal plain, the fertile San Joaquin Valley, the arid Mojave Desert, and the high Sierra Nevada, all within a radius of about 100 miles. In other areas it is possible to go snow skiing in the morning and surfing in the evening of the same day, without having to travel long distance. Contrast abounds in California. The highest point in the United States (outside Alaska) is in California, and so is the lowest point (including Alaska). Mount Whitney, 14,494 feet above sea level, is separated from Death Valley, 282 feet below sea level, by a distance of only 100 miles. The two areas have a difference in altitude of almost three miles. California has deep, clear mountain lakes like Lake Tahoe, the deepest in the country, but it also has shallow, salty desert lakes. It has Lake Tulainyo, 12,020 feet above sea level, and the lowest lake in the country, the Salton Sea, 236 feet below sea level. Some of its lakes, like Owens Lake in Death Valley, are not lakes at all: they are dried-up lake beds. In addition to mountains, lakes, valleys, deserts, and plateaus, California has its Pacific coastline, stretching longer than the coastlines of Oregon and Washington combined. Which of the following is the lowest point in the United States？ A．Lake Tulainyo. B．Mojave desert. C．Death Valley. D．The Salton Sea.

A．are less active than in the past B．are more active than in the past C．are sitting as much as they used to be D．are sitting as less as they used to be

A．play a greater part in looking after the children B．help his wife by doing most of the housework C．feel dissatisfied with his role in the family D．take a part-time job so that he can help in the home

(83)

2. Yet the implication that rapid change is a new phenomenon is again misleading. If you measure the time it takes for a technology to become widely diffused, today's experience does not seem unusual. Take the car. The basic patent for an internal-combustion engine capable of powering a car was fried in 1877. By the late 1920s—50 years later—over half of all American households owned a car. 3. The comparable dates for the computer axe harder to tie down, but the first big computer, based on vacuum valves, was built in 1946. The transistor—the first semiconductor device—was invented at Bell Laboratories in 1948. The first patent for an integrated circuit was filed in 1959. Now, in 1999-50 years after the first one was built—around half of American households own a computer. The pace of introduction has been similar to that of the car. 4. You have to cheat, choosing only the date for the personal computer, say(mid-1970s), or the internet (ditto) to make it seem much more rapid. Comparing its diffusion among private users is, you might say, unfair to the computer, for that machine's main use is in businesses. On that measure, the best historical analogy is with electrification, and the spread of the electric dynamo into factories. 5. According to Paul David, a historian at Stanford University in California, the first electricity-generating stations had been installed in New York and London in 1881, but it was well into the 1920s before the dynamo became widely used and started to raise productivity. The adoption of the computer in business has also been slow, and failed to have any measurable impact on productivity until very recently.

A．illness B．virus C．weakness D．attachment

yesterday he and his father ____.

是 否