长宁区2015年高三英语二模试卷(3)

CHANGES AND REFUNDS

Tickets may be refunded not later 5 minutes before the departure of the train for a charge of 15% of the ticket price, or the journey may be changed to another day for a charge of 10% of the ticket price. (Not applicable to same day returns.)

CHANGES FOR SAME DAY TRAVEL

You may change your ticket once without charge for a journey on the same day as the original ticket.

INFORMATION OF INTEREST TO TRAVELLERS

When you buy your ticket, it is up to you to check that the dates and time of the journey on it are exactly as you requested.

Tickets control and access to each train platform will be open until 2 minutes before departure of the train.

Each traveler may take one suitcase and one item of hand luggage. You may also check in 15kgs of luggage not later than 30 minutes before departure, at no extra charge.

If you would like to charter a train, or make reservations for over 25 passengers traveling together, call the Sales Department.

OUR TIMETABLE IS GUARANTEED

If the arrival of your train at you destination is delayed by more than 5 minutes according to the timetable, we will refund the full price of your ticket if the delay is caused by our company.

长宁区2015年高三英语二模试卷,word版含答案

70.How much will a passenger pay if he wants to alter his ticket to three days later?

A.25% of the original price B.20% of the original price

C.15% of the original price D.10% of the original price

71.The limit of luggage for a single passenger is A.One suitcase, one handbag and one 15kgs check-in luggage

B.One handbag, two pieces of 15kgs check-in luggage.

C.One handbag and two pieces of 15kgs check-in luggage.

D.One suitcase, one handbag and one 30kgs check-in luggage.

72.What does the Train Company guarantee?

A.Students,children,senior citizens and groups can get 25% discount of the original price.

B.Passengers get the full price of the tickets back if the train if delayed over five minutes.

C.Same-day-returns can be fully refunded if they are canceled two minutes before departure.

D.People with Globe-trotter tickets can take any kind of the discounts listed in the brochure.

(C)

How do predators (猎食动物) affect populations of the prey (猎物) animals? The answer is not as simple as might be thought. The Moose(麋鹿) reached Isle Royale in Lake Superior by crossing over winter ice and bred freely there in isolation without predators. When wolves later reached the island, naturalists widely assumed that the wolves would play a key role in controlling the moose population. Careful studies have demonstrated, however, that this is not the case. The wolves eat mostly old or diseased animals that would not survive long anyway. In general, the moose population is controlled by food availability, disease and other factors rather than by wolves.

When experimental populations are set up under simple laboratory conditions, the predator often wipes out its prey and then becomes extinct itself. However, if safe areas like those prey animals have in the wild are provided, the prey population drops to low level but not extinction. Low prey population levels then provide inadequate food for the predators, causing the predator population to decrease. When this occurs, the prey population can rebound. In this situation the predator and prey population may continue in this cyclical pattern for some time.

Population cycles are characteristic of small mammals, and they sometimes appear to be brought about by predators. Ecologists studying hare populations have found that the North American snowshoe hare follows a roughly ten-year cycle. Its numbers fall tenfold to thirty in a typical cycle, and a hundredfold change can occur. Two factors appear to be generating the cycle: food plants and predators.

The preferred foods of snowshoe hares are tender willow branches. As the hare population increases, the quantity of these branches decreases, forcing the hares to feed on low-quality high-fiber food. Lower birth rates and low growth rates follow, so there is a corresponding decline in hare abundance. Once the hare population has declined, it takes two to three year for the quantity of branches to recover.

A key predator of the snowshoe hare is the Canada lynx. The Canada lynx shows a ten-year cycle of abundance(大量) that parallels the abundance cycle of hares. As hare numbers fall, so do lynx numbers, as their food supply decreased.

Predators are an essential factor in maintaining communities that are rich and diverse in species. Without predators, the species that is the best competitor for food, shelter, and other environmental resources tends to dominate and exclude the species with which it competes. This

长宁区2015年高三英语二模试卷,word版含答案

phenomenon is known as “competitor exclusion”. However, if the community contains a predator of the strongest competitor species, then the population of that competitor is controlled. Thus even the less competitive species are able to survive. From the stand point of diversity(多样性), it is usually a mistake to eliminate a major predator from a community.

73. The author uses the example of the moose and wolves on Isle Royale to _________________.

A. provide evidence that predators influence prey populations

B. question the belief in the effect of predators on prey populations

C. demonstrate predator population grows faster than that of the prey

D. prove that studies of isolated populations tend to be useful

74. The word “rebound” in the passage is closest in meaning to _____________.

A. React B. Resist C. Remain D. Recover

75. Which of the following is true according to the passage?

A. Laboratory results can’t explain the changes in p …… 此处隐藏：5655字，全部文档内容请下载后查看。喜欢就下载吧 ……