单选题Howmanytiesdoesthemanhaveatleast?

单选题Whoisthewoman?

单选题What did Greg Rota probably do in the end?

单选题______unemployment is high, crime is high too; it can be assumed that the latter is due to the former.[A] Before[B] Where[C] Unless[D] Until

单选题—Do you see why he hasn't turned up yet?—Sorry, I don't know.

单选题Whatarethespeakerstalkingabout?

单选题I saw ______ cars and trucks outside the building at dusk.

单选题The flower is dead. I ______ it more water. A. would have given B. should have given C. must have given D. had to give

单选题He told us to use our dictionaries to ______any words we didn't understand.[A] look for[B] look out[C] look up[D] look at

单选题

单选题WhereistheNationalArtsCenter?

单选题Mark Twain said in a loud voice because ______.

单选题Wheredoestheconversationtakeplace?A.Ataclinic.B.Atarestaurant.C.Atapharmacy.

单选题--$500,but that is my last offer.--OK, it is a ______.

单选题______ has ridden on a railway train knows how ______ another train flashes by when it is traveling in the opposite direction.

单选题{{B}}D{{/B}} There are approximately three quarters of a ton of termites (白蚁) for every person on Earth. It now turns out that these critters may be helping to alter the climate and affect man's life. For years scientists have been saying that carbon dioxide sent into the atmosphere by the burning of fuels might lead to the rise in temperatures of the whole earth, owing to the greenhouse effect in which the gas prevents the escape of heat into outer space. Now an international team of researchers has discovered that termites generate more than twice the carbon dioxide that fuel burning does. And this production, which comes from the insects' eating and consuming of different kinds of vegetables and wood, has risen greatly. This is chiefly because man has cut so many trees in order to open more land and thus has provided large quantities of food for the insects in the form of tiny pieces of wood. The output from the burning of fuels is of greater concern, however, because it is continuing to rise steadily and so far no effective measures have been taken to reduce the amount of carbon elements in this way. Production by termites, on the other hand, is not likely to increase much more.