单选题Terraforming (Earth-forming) other planets, also known as planetary engineering, seems like a task still centuries away for mankind to (31) . However, it is a vigorous topic that attracts both popular and (32) interest. Why should the (33) of terraforming other planets be studied when it may be centuries (34) we know enough to even decide if it's a good idea? Mankind is getting more and more (35) facts about other planets. The atmosphere of Venus has been (36) ; (37) have surveyed the surface of Mars; Mercury, Jupiter and Saturn have been studied by spacecraft. (38) have been answered; new questions have been (39) , and enough hard data is right now becoming available to allow us to make the first (40) of planetary engineering. In the past, people (41) excellent ideas about terraforming have kept them to themselves, or buried them in a desk drawer (42) they did not realize that anyone else was interested. But now, a (43) circle of people has begun to do this kind of work. For instance, NASA funded a project on transforming Mars. There are several strong reasons (44) demand that the possibilities of terraforming be studied carefully. First, it's an (45) idea of a possible future for human beings. Such thinking has a valuable role in (46) options for our future directions. Secondly, the techniques of terraforming will (47) help contemporary technologies in weather and (48) control. Thirdly, such study (49) assist us in detecting any possible existence of extraterrestrial intelligence and (50) civilizations on other planets.

单选题Hurricanes are severe cyclones with winds over seventy five miles an hour originate over tropical ocean waters.

单选题Mobility is one of the characteristics often ______ executives, and they must accustom themselves to moving quite regularly. A. demanded of B. asked for C. expected from D. called for

单选题I wish I hadn't been so busy this morning, otherwise I ______ you with the cleaning.A. will have helpedB. should helpC. could have helpedD. could help

单选题A well coherent discourse ______ good choice of cohesive devices and semantic selection among other things.[A] calls for[B] calls on[C] calls up[D] calls forth

单选题We can infer from the passage that the writer shares the belief about fairies that ______.

单选题{{I}} Decide which of the choices given below would best complete the passage if inserted in the corresponding blanks. Mark the best choice for each blank on your answer sheet.{{/I}} Some call it the Smart Shooter, a new rifle for American infantry troops that is two weapons in one, is accurate up to 1,000 yards and in {{U}} {{U}} 1 {{/U}} {{/U}}fires {{U}} {{U}} 2 {{/U}} {{/U}} corners. Its message to enemies is that they can run but they can't hide. Still in the development phase, the rifle for 2006 has just been {{U}} {{U}} 3 {{/U}} {{/U}}off with great {{U}} {{U}} 4 {{/U}} {{/U}}by the Pentagon to members of Congress who will be asked to {{U}} {{U}} 5 {{/U}} {{/U}}the money. The makers, Alliant Tech systems, say that the weapon will revolutionize {{U}} {{U}} 6 {{/U}} {{/U}}combat much as the machine gun. Pentagon jargon has given the new gun a(an) {{U}} {{U}} 7 {{/U}} {{/U}}title: the Objective Individual Combat Weapon. {{U}} {{U}} 8 {{/U}} {{/U}}one trigger, the rifle can fire a standard 5.56mm Nato bullet and a 20mm high explosive shell that will burst in the air. It can {{U}} {{U}} 9 {{/U}} {{/U}}shrapnel behind, {{U}} {{U}} 10 {{/U}} {{/U}} or even from the side of enemy troops who have taken {{U}} {{U}} 11 {{/U}} {{/U}}behind a building. The shell can be {{U}} {{U}} 12 {{/U}} {{/U}}to explode after a short delay. The weapon's 1,000 yard accuracy is twice {{U}} {{U}} 13 {{/U}} {{/U}}of other rifles, made possible by a laser system built into the sight. This rangefinder fixes the target, measures the distance and passes it along to a computer chip in the shell. The gun sight has an infrared lens for night {{U}} {{U}} 14 {{/U}} {{/U}}. It can also have video camera with a zoom lens that is linked to a video display attached to the soldier's helmet, allowing him to aim {{U}} {{U}} 15 {{/U}} {{/U}}without exposing himself to enemy return fire. But there are snags still be {{U}} {{U}} 16 {{/U}} {{/U}}out. Two men were {{U}} {{U}} 17 {{/U}} {{/U}}when a shell burst in a barrel during firing tests. The rifle weighs more than 181 b. There are questions whether its electronic innards will be rugged enough for rain, snow and difficult {{U}} {{U}} 18 {{/U}} {{/U}} Michael Klare, a professor of peace and world security issues and a board member of the Arms Control Association, says that the Pentagon is seeking this combination of firepower and automation to compensate for the uncertain aim of GIs. He said :" Soldiers won't have to worry about careful steady aim. They'll just look {{U}} {{U}} 19 {{/U}} {{/U}}the viewfinder and {{U}} {{U}} 20 {{/U}} {{/U}}the trigger."

单选题Questions 4 to 6 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now, listen to the conversation.

单选题A large bird was watching us intently from the top of a ______ van.

单选题Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.

单选题I only caught a ______ of the letter, so I can't remember where it is from.

单选题A long line of traffic had to wait at the ______ until the train had passed.

单选题When Mr. Green was away on business, his neighbor gave his wife a(n) ______ with the housework. A.aid B.help C.hand D.lift

单选题Since 1895 the National Trust has (1) the preservation of places of historic interest and natural beauty in England, Wales and Northern Ireland. Today the Trust (2) is not a government department but a charity depending on the (3) support of the public and its own members--is the largest landowner and conservation society in Britain. (4) you go, you are close to land that is protected and (5) by the National Trust. Over 350 miles of (6) land, lakes and forests in one area of natural beauty (7) ; prehistoric and Roman ruins; moorlands and farmland, woods and islands; lengths of (8) waterways; even seventeen whole villages—all are (9) the public at all times subject only (10) the needs of farming, forestry and the protection of wildlife. But the Trust's protection (11) further than this. It has in its possession a hundred gardens and (12) two hundred historic buildings which it opens to paying visitors. Castles and churches, houses of (13) or historic importance, mills, gardens and parks (14) to the Trust by their former owners. Many houses retain their (15) contents of fine furniture, pictures, and other treasures accumulated over (16) , and often the donor himself (17) to live in part of the house as a (18) of the National Trust. The walking-sticks in the hall, the flowers, silver- framed photographs, books and papers in the rooms are (19) that the house is still loved and (20) and that visitors are welcomed as private individuals just as much as tourists.

单选题I wrote back to Charles______I received his letter. A. when immediately B. soon C. immediately D. suddenly

单选题The author began to love books for the following reasons EXCEPT that