单选题Not till he got home ______ that he had lost his keys.

单选题The company owns a large number of _______ stores.

单选题The basic rock material is referred to ______.

单选题I hope to hear more about the activities __ there.

单选题After the neutral warm-up, US negotiating partners quickly___the point.

单选题The passage implies, though it does not explicitly state, that _______ is ( are) the most promising approach to the long-term monitoring of environmental factors.

单选题Questions 41 to 44 are based on the following passage: 　　The Antarctica treaty applies to all areas (the high seas excepted) below latitude 60 degrees south. This line, running around the globe some 2,000 miles from the South Pole itself, just misses the lower tip of South America, and is well below the Cape of Good Hope and New Zealand. There are a number of small islands between this line and the Antarctic continent, but the waters here are known to mariners as "the screaming Sixties" because there is so little obstruction to the world-circling winds. 　　In contrast, in the northern hemisphere, the lands lying above the sixtieth parallel of latitude include much of Scandinavia, Siberia and Alaska, all of Greenland and Iceland, with a total population of several million. Great mountains help subdue the winds; a spur of the Gulf Stream and part of the Japan Current temper the frigid airs of this polar region. This, and the presence of the Arctic Ocean in the center of the great land mass, give the area a markedly different conformation and climate from that around the opposite pole. Antarctica seems a vast basin of rock, filled and overflowing with a load of ice. In the heart of the continent it is almost as high as the summits of the Alps, yet soundings show that in some places the rock floor is below sea level. Actually, the ice accumulation is less than it was perhaps 1,000 years ago. Its seaward flow is not so voluminous as it once was, and as a result there are patches of bare rock here and there along the coast and inland. They were scoured clear of soil ages ago, but one may sometimes find moss or lichens growing, though virtually no flowering plants.

单选题She apologized for __ the meeting.

单选题We would like to hear some more ideas, ______ this matter?

单选题Devotion means __ our heart on one thing at a time and give up all other thoughts.

单选题The taxi had to ____ because the traffic light had turned red.

单选题That caves of Altamira, which were __ in northern Spain, contain interesting paintings by early cave dwellers.

单选题An Olympic runner wins a _______.

单选题A person with several bad listening habits would be considered ___ by Dr. Nichols

单选题China is larger than__.

单选题It can be inferred from the passage that typical court cases are __

单选题You'll have to buy some new shoes as these are __

单选题The fresh air is sometimes humid from the _______rainfall of this area.

单选题Almost 70 percent of all non-food purchases in supermarkets are generated by in-store.

单选题It is the earth's 40 mile deep crust with __ we are concerned when we seek the cause of earthquake.