— I heard they went skating in the mountains last winter.

— It _____ true because there was little snow there.

A. may not be          B. won’t be        C. couldn’t        D. mustn’t be

Sir, you ______ be sitting in this waiting room. It is for women and children only.

A. oughtn’t to   B. can’t        C. won’t     D. needn’t

John, look at the time. ______ you play the piano at such a late hour ?

A. Must      B. Can        C. May       D. Need

The job is great _____ salary,but it has its disadvantages.

A.other than      B.except for            C.in view of       D.in terms of

----There is only three days lef,but we still have a pile of papers to deal with.

---- Don’t worry. We have already______ two thirds of them after all

  A. got over    B. got through    C. given up   D. given away.

You’d better do ___ I told you.

        A.when       B.as      C.since       D.for

Being League members, ___ we ought to work hard at our lessons;___ we ought to take an active part in social activities.

A.     on one hand…on other hand       B.on the one hand….on the other hand

 C. on the one hand…on the other      D.B and C

Before traveling in space, you must know what it might feel like_____in an imaginary environment.  

  A. to travel     B. traveling     C. to be traveling     D. travel

More than a year later he arrived back in America ______.

    A.ill, tired and unhappy               B.with ill, tired and unhappy

    C. felt ill, tired and unhappy            D. be felt ill, tired and unhappy

Sometimes, the simplest ideas are the best. For example, to absorb heat from the sun to heat water, you need large, flat, black surfaces. One way to do that is to build those surfaces specially, on the roofs of buildings. But why go to all that trouble when cities are full of black surfaces already, in the form of asphalt (柏油) roads?

    Ten years ago, this thought came into the mind of Arian de Bondt, a Dutch engineer. He finally persuaded his boss to follow it up. The result is that their building is now heated in winter and cooled in summer by a system that relies on the surface of the road outside.

    The heat-collector is a system of connected water pipes. Most of them ran from one side of the street to the other, just under the asphalt road. Some, however, dive deep into the ground.

    When the street surface gets hot in summer, water pumped through the pipes picks up this heat and takes it underground through one of the diving pipes. At a depth of 100 metres lies a natural aquifer (蓄水层) into which several heat exchangers (交换器) have been built. The hot water from the street runs through these exchangers, warning the ground-water, before returning to the surface through another pipe. The aquifer is thus used as a heat store.

    In winter, the working system is changed slightly. Water is pumped through the heat exchangers to pick up the heat stored during summer. This water goes into the building and is used to warm the place up. After performing that task, it is pumped under the asphalt and its remaining heat keeps the road free of snow and ice.

Which of the following is true according to the first two paragraphs?  

        A. Arian de Bondt got his idea from his boss.

        B. Large, flat, black surfaces need to be built in cities.

C. The Dutch engineer’s system has been widely used.

D. Heat can also be collected from asphalt roads.

For what purpose are the diving pipes used?  

        A. To absorb heat from the sun.             B. To store heat for future use.

C. To turn solar energy into heat energy.      D. To carry heat down below the surface.

From the last paragraph we can learn that __ 

        A. some pipes have to be re-arranged in winter

        B. the system can do more than warming up the building

        C. the exchangers will pick up heat from the street surface

        D. less heat may be collected in winter than in summer

What is most likely to be discussed in the paragraph that follows?  

         A. What we shall do if the system goes wrong.

         B. What we shall do if there are no asphalt roads.

         C. How the system cools the building in summer.

        D. How the system collects heat in spring and autumn