单选题Lily: Have you lost weight? Mary:______

单选题The main point of paragraph 5 is ______.

单选题What conclusion can be drawn from the essay about the United States during the time of Henry Ford's youth?

单选题This ad will be very helpful to______.

单选题She felt a bit ______ in the autumn air so she went in to fetch a coat.

单选题Each plant and animal by natural tendency, ______ far more seeds and eggs and seedlings and young, than is necessary to maintain ______ population.

单选题The children were having a wonderful time ______ on the frozen lake. A. slipping B. slithering C. skidding D. sliding

单选题It is no ______ that his car was seen near the bank at the time of the robbery.

单选题His major task is to integrate the work of various bureaus under the ministry.

单选题 Volcanoes are the ultimate earth-moving machinery. Eruptions have rifted continents, raised mountain chains, constructed islands and shaped the topography of the earth. The entire ocean floor has a basement of volcanic basalt. Volcanoes have not only made the continents, they are also thought to have made the world's first stable atmosphere and provided all the water for the oceans, rivers and ice-caps. There are now about 600 active volcanoes. Every year they add two or three cubic kilometers of rock to the continents. Imagine a similar number of volcanoes smoking away for the last 3,500 million years. That is enough rock to explain the continental crust. What comes out of volcanic craters is mostly gas. More than 90% of this gas is water vapor from the deep earth: enough to explain, over 3,500 million years, the water in the oceans. The rest of the gas is nitrogen, carbon dioxide, sulphur dioxide, methane, ammonia and hydrogen. The quantity of these gases, again multiplied over 3,500 million years, is enough to explain the mass of the world's atmosphere. We are alive because volcanoes provided the soil, air and water we need. Geologists consider the earth as having a molten core, surrounded by a semi-molten mantle and a brittle, outer skin. It helps to think of a soft-boiled egg with a runny yolk, a firm but squishy white and a hard shell. If the shell is even slightly cracked during boiling, the white material bubbles out and sets like a tiny mountain chain over the crack—like an archipelago of volcanic islands such as the Hawaiian Islands. But the earth is so much bigger and the mantle below is so much hotter. Even though the mantle rocks are kept solid by overlying pressure, they can still slowly 'flow' like thick treacle. The flow, thought to be in the form of convection currents, is powerful enough to fracture the 'eggshell' of the crust into plates, and keep them bumping and grinding against each other, or even overlapping, at the rate of a few centimeters a year. These fracture zones, where the collisions occur, are where earthquakes happen. And, very often, volcanoes.

单选题I learned to ______a bicycle as a small boy.

单选题The period ranging from 1865 to 1914 has been referred to as______in the literary history of the United States.

单选题Mrs. Lackey was awakened by the ringing of the bedside phone and learned that 12 hours ago her husband's boat had been ______.

单选题New data has______that the damage to the ozone layer is not confined to the southern hemisphere.

单选题There is a ______ difference in meaning, between the words surroundings and environment. A. gentle B. subtle C. feeble D. humble

单选题As we have seen, propaganda can appeal to us by arousing our emotions or ______, our attention from the real issues at hand.

单选题There is so much water in the Atlantic ______ it is hard to imagine how much there is.

单选题As an ______ part of China, Kongkong returned to the embrace of its motherland in July, 1997.