Frequent cleaning of accumulated residue inside the USB plug to prolong the product life．

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发布时间：2019-08-25

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第1题

Instead of "intelligence," some people prefer to speak of "awareness." In any case, cetace

ans probably have a very different awareness and perception of their environment than do humans. Maybe one day we will come to understand cetaceans on their terms instead of ours, and perhaps we will discover a mental sophistication rivaling our own.

A．This type of learning, however, is called conditioning. This reward is merely one possible type of positive reinforcement that leads to more frequent repetition of the behavior. in the future. The animal simply learns that when it performs a particular behavior, it gets a reward, usually a fish. Instead of "intelligence," some people prefer to s Many animals, including rats, birds, and even invertebrates, can be conditioned to perform. tricks.We certainly don"t think of these animals as our mental rivals.Unlike most other animals, however, dolphins quickly learn by observations and may spontaneously imitate human activities. One tame dolphin watched a diver cleaning an underwater viewing window, seized a feather in its beak, and began imitating the diver—complete with sound effects! Dolphins have also been seen imitating seals, turtles, and even water-skiers.

B．This type of learning, however, is called conditioning. Instead of "intelligence," some people prefer to s The animal simply learns that when it performs a particular behavior, it gets a reward, usually a fish. This reward is merely one possible type of positive reinforcement that leads to more frequent repetition of the behavior. in the future. Many animals, including rats, birds, and even invertebrates, can be conditioned to perform. tricks. Instead of "intelligence," some people prefer to s We certainly don"t think of these animals as our mental rivals.Unlike most other animals, however, dolphins quickly learn by observations and may spontaneously imitate human activities. One tame dolphin watched a diver cleaning an underwater viewing window, seized a feather in its beak, and began imitating the diver—complete with sound effects! Dolphins have also been seen imitating seals, turtles, and even water-skiers.

C．This type of learning, however, is called conditioning. Instead of "intelligence," some people prefer to s The animal simply learns that when it performs a particular behavior, it gets a reward, usually a fish.Many animals, including rats, birds, and even invertebrates, can be conditioned to perform. tricks. This reward is merely one possible type of positive reinforcement that leads to more frequent repetition of the behavior. in the future. We certainly don"t think of these animals as our mental rivals. Instead of "intelligence," some people prefer to s Unlike most other animals, however, dolphins quickly learn by observations and may spontaneously imitate human activities. One tame dolphin watched a diver cleaning an underwater viewing window, seized a feather in its beak, and began imitating the diver—complete with sound effects! Dolphins have also been seen imitating seals, turtles, and even water-skiers.

D．This type of learning, however, is called conditioning. Instead of "intelligence," some people prefer to s The animal simply learns that when it performs a particular behavior, it gets a reward, usually a fish.Many animals, including rats, birds, and even invertebrates, can be conditioned to perform. tricks.We certainly don"t think of these animals as our mental rivals. This reward is merely one possible type of positive reinforcement that leads to more frequent repetition of the behavior. in the future. Unlike most other animals, however, dolphins quickly learn by observations and may spontaneously imitate human activities. One tame dolphin watched a diver cleaning an underwater viewing window, seized a feather in its beak, and began imitating the diver—complete with sound effects! Dolphins have also been seen imitating seals, turtles, and even water-skiers.

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第2题

Business travelers find that some jobs take them away from home for longer than a few days

at a time. Those who find themselves at a new job site for weeks or even months often find it more comfortable and economical to stay at an apartment-hotel rather than a traditional style. hotel. The comfort and convenience of these short-term residences are making them more and more popular among frequent business travelers. They provide advantages that more

luxurious traditional hotels do not. Apartment-hotels offer both small and full-size apartments that are available to rent on a weekly or monthly basis. Apartments are fully furnished with everything from sofas and writing desks to dishes and silverware. They also usually include cable TV service and Internet access. Best of all, they are run like hotels, with cleaning and linen services, exercise rooms and restaurants, and a desk clerk to take messages and help tenants with questions about the city. In addition, the prices are much more reasonable than the rates normally charged at a traditional hotel. One of the reasons that many apartment-hotels are economically priced is that they are often not found in a city's downtown area. This is not necessarily a disadvantage, however. They are usually conveniently located near public transportation, so the expense of a rental car is not always necessary. In short, apartment-hotels offer a convenient alternative to the business traveler, as they are more cost-effective than traditional hotels and more comfortable than hastily furnished apartments. Many business travelers find that apartment-hotels are as comfortable as it is possible to be away from home.

Why are these residences called "apartment-hotels"？

A．They have characteristics of apartments and hotels.

B．They contain full-sized apartments.

C．They look like hotels.

D．They have only short-term tenants.

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第3题

We often________our classroom after school.

A.are cleaning

B.clean

C.is cleaning

D.cleans