8,Which of the following best completes the passage below?

At large amusement parks, live shows are used very deliberately to influence crowd movements. Lunchtime performances relieve the pressure on a park’s restaurants. Evening performances have a rather different purpose: to encourage visitors to stay for supper. Behind this surface divergence in immediate purpose there is the unified underlying goal of______

(A) keeping the lines at the various rides short by drawing off part of the crowd

(B) enhancing revenue by attracting people who come only for the live shows and then leave the park

(C) avoiding as far as possible traffic jams caused by visitors entering or leaving the park

(D) encouraging as many people as possible to come to the park in order to eat at the restaurants

(E) utilizing the restaurants at optimal levels for as much of the day as possible

The Answer is E. I was totally confused about the how the background is linked with the utilization of the restaurant! Please help!

15,Technological education is worsening. People between eighteen and twenty-four, who are just emerging from their formal education, are more likely to be technologically illiterate than somewhat older adults. And yet, issues for public referenda will increasingly involve aspects of technology.

Which of the following conclusions can be properly drawn from the statements above?

(A) If all young people are to make informed decisions on public referenda, many of them must learn more about technology.

(B) Thorough studies of technological issues and innovations should be made a required part of the public and private school curriculum.

(C) It should be suggested that prospective voters attend applied science courses in order to acquire a minimal competency in technical matters.

(D) If young people are not to be overly influenced by famous technocrats, they must increase their knowledge of pure science.

(E) On public referenda issues, young people tend to confuse real or probable technologies with impossible ideals.

The answer provided is A. I cannot clearly understand why referenda need specific technology that the youth must learn.

20,Archaeologists seeking the location of a legendary siege and destruction of a city are excavating in several possible places, including a middle and a lower layer of a large mound. The bottom of the middle layer contains some pieces of pottery of type 3, known to be from a later period than the time of the destruction of the city, but the lower layer does not.

The force of the evidence cited above is most seriously weakened if which of the following is true?

(A) Gerbils, small animals long native to the area, dig large burrows into which objects can fall when the burrows collapse.

(B) Pottery of types 1 and 2, found in the lower level, was used in the cities from which, according to the legend, the besieging forces came.

(C) Several pieces of stone from a lower-layer wall have been found incorporated into the remains of a building in the middle layer.

(D) Both the middle and the lower layer show evidence of large-scale destruction of habitations by fire.（A）

(E) Bronze ax heads of a type used at the time of the siege were found in the lower level of excavation.

The answer provided, A, seems unrelated to the passage! Does it need profesional knowledge to work out ? NN, please give some advice!