题目内容
Pack the cake in a strong box, or it might get _____ in the post.
A. splashed B. spilt C. crushed D. crashed
C. 考查被动中的动词词义辨析。crush压坏，压碎；弄皱；辗散； splash溅，泼；split（中间）裂开；crash（向下）猛跌；（飞机）失事。
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高效智能课时作业系列答案Bears and humans often meet in National Parks. Although campers and hikers are warned not to feed the bears, many people ignore these warnings and feed the beasts anyway. When bears are used to people’s food, problems soon arise.
Bears like to eat a large variety of things, both meat and vegetable. Without human assistance, bears live nicely on roots, twigs, leaves of trees, insects and small animals. With people around, the bears’ tastes quickly expand to include sandwiches, hot dogs, hamburgers, and anything else they can temp humans into giving up.
Bears often develop clever strategies for getting people to let go their food supplies. More often than not, an unsuspecting hiker has taken off his or her pack for a rest only to have a bear charge out of the woods, grab the pack and quickly disappear into the underbrush with it. Hanging the pack on a tree branch won’t help. Bears have been known to climb up, jump off, and catch the pack on the way down. One mother bear stretched up with her baby on her shoulders to reach a pack stored on a pole. Many bears threaten people into giving up their supplies. Although a bear is unlikely to attack a person and would probably run away if screamed at, few people are willing to do so. Most people drop the pack and run the other way. This, of course, delights the bear. In some places, the Park Service installed some metal barrels with lids to help campers keep their supplies safe from bears. Although the bears were unable to open these containers, the effort was less than successful. Most campers, unable to tell the metal drums from rubbish cans, never used them for the intended purpose.
【小题1】Feeding bears on people’s food .
| A．brings the people a lot of fun | B．can cause problems |
| C．often causes injuries and deaths | D．helps bears survive |
| A．might be satisfied with what they had originally |
| B．would have starved long before |
| C．wouldn’t have enough food supply |
| D．would have hunted for other kind of food |
| A．If fed on sandwiches and hot dogs, the bears would no longer eat roots, twigs and insects . |
| B．It’s likely that bears would hurt people if the people didn’t give up their food. |
| C．Most people would frighten away the bears that would temp their food. |
| D．Seeing a pack, the bear would quickly snatch it and run away with it. |
| A．bears were clever enough to get the food in them |
| B．they were left open in the open air |
| C．people were not sure of their use |
| D．they were once used as rubbish cans |
The dream of flying like Buzz Lightyear never dies. For years, space-age inventors have tested one wearable jet pack after another. And time after time, the designs have been grounded by dangerous fuels, excessive weight, or very loud noise levels. Now a Canadian inventor has sidestepped those weaknesses with an aquatic jet pack. Designed for travel over lakes or oceans, it’s driven by pressurized water, not burning rocket fuel.
When Raymond Li first told the idea for the aquatic jet pack to his friends, they said he must be nuts. How could a jet pack carry that much water? Its thrust-to-weight rate would be so low and it would never become airborne. Thrust-to-weight rate is a measure of the forward force produced compared with the weight of the vehicle. A vehicle with a low thrust-to-weight rate is relatively heavy for the amount of force it generates.
Li's genius idea was to place the jet pack’s engine and its water pump in a separate boat. The pump would draw water from the lake the boat was floating on. It would then force the water under pressure through a hose connected to the jet pack. The hose would be long enough to let the pack go up as high as 8.5 meters (28 feet) in the air.
Today, Li's invention, the Jetlev-Flyer, is ready to go into production. The pack itself, complete with jet nozzles （管嘴） and handlebars, weighs just 14 kilograms. The 
boat is a floating pod. To take off, the operator hits a trigger on a handlebar, which starts the pump, and then turns the throttle. Two streams of high-velocity water shoot through the hose and out the nozzles, lifting the operator into the air. The operator hovers there or pushes down on the handlebars, zooming forward at speeds of up to 64 kilometers per hour, pulling the pod behind.
【小题1】All the following factors contribute to the failure of inventing a wearable jet pack EXCEPT ______.
| A．excessive water | B．unbearable noise | C．unsafe fuels | D．too much weight |
| A．improved | B．reduced | C．avoided | D．solved |
| A．exciting | B．crazy | C．realistic | D．creative |
| A．His friends encouraged him to do the invention. |
| B．He put the engine and its water pump in the same boat. |
| C．The success of his invention lies in his bravery. |
| D．His invention finally succeeded and will go into production. |
a. The throttle is turned. b. The operator is lifted into the air.
c. A trigger is hit. d. Two streams of water shoot out.
The pump is started.
| A．c, e, a, d, b | B．c, e, a, b, d | C．e, c, d, b, a | D．e, a, c, d, b |