单选题Some researchers feel that certain people have nervous systems particularly ______ to hot, dry winds. They are what we call weather-sensitive people.

单选题Beth ( ) California in 1981 and ( )in Texas ever since.

单选题It looks like a great big cigar, (1) it is really a dangerous saltwater fish called barracuda. This (2) fish has a narrow body which grows to be from four to six feet long. However it may reach ten feet in (3) ! The barracuda looks very much (4) the pike, a freshwater fish. Although the barracuda is not related (5) the pike, it is like that freshwater fish in being a fearless fighter. The barracuda has a large mouth and strong jaws that hold knifelike (6) . When attacking or defending (7) the barracuda moves like lightning. It usually feeds on other fish. But it has been known to (8) swimmers. No wonder it is called "the tiger of the sea" ! The barracuda is usually found in warm, tropical seas or (9) . The most dangerous kind, the great barracuda, is found off the (10) of Florida, Bermuda, and the West Indies. (11) caught for food live in the warm waters off the coast of California and Australia. To (12) its enemies, the barracuda can camouflage itself. It does this by taking on the color of its (13) . Its back changes from light brownish green (14) deep blue, its sides sparkle with silvery tones, and its belly is chalky white. The barracuda's tail and fins may be greenish yellow or gray. Bright eyes flash as it roams the (15) . When it rests on the sandy ocean floor, it becomes ahnost (16) as long as it stays quite still. Even when it prowls around a coral reef, it is difficult to spot, even in (17) water. People who (18) for sport try to excite the barracuda to move by tying a long, white rag behind their moving boat. However, they are often (19) . But they never give up trying to trick "the (20) of the sea/

单选题 --Was the gentleman´s name David？ --No. I don´t think so， but_________， go on， please.

单选题Some areas, ______ their severe weather conditions, are sparsely populated.

单选题Some workers in the nuclear power station were exposed to high levels of ______ .

单选题Although Barbara argues strongly that current policies are unjust, she does not ______any particular changes.

单选题______is defined as a conscious process of accumulating knowledge of a second language usually obtained in school settings.

单选题When you go to a new country, you must adapt yourself to the new manners and ______.

单选题If there are any new words, ______ in a dictionary.

单选题 The small mountain city was ______ by the snow for more than ten days.

单选题The San Andreas fault is ______.

单选题The purpose of the author in writing this text is

单选题 Regardless of our uneasiness about stereotypes, numerous studies have shown clear difference between Chinese and western parenting.

单选题Children (who) form a positive self-concept are more assertive, optimistic, (confidence), and sociable (than those) who (do not).

单选题Speaker A (Treading on B's foot. ): ______. I hope I haven't hurt you.Speaker B: It's all right.