单选题It is necessary that he____ the assignment without delay.

单选题Without sun"s light ______ the earth"s surface, no life could exist on the earth.

单选题Darkness approached and a cold, angry wind gnawed at the tent like a mad dog. Camped above treeline in the Wind River Mountains of Wyoming, the torrents of air were not unexpected and only a minor disturbance compared to the bestial gnawing going on behind my belly button. In an attempt to limit exposure of my bare bottom to the ice-toothed storm, I had pre-dug a haft dozen catholes within dashing distance. Over and over, through the long night, the same scenario was repeated: out of the bay, out of the tent, rush, squat, rush back. "Everyone can master a grief," wrote Shakespeare, "but he that has it." Diarrhea, the modem word, resembles the old Greek expression for "a flowing through." Ancient Egyptian doctors left descriptions of the suffering of Pharaohs scratched on papyrus even before Hippocrates, the old Greek, gave it a name few people can spell correctly. An equal opportunity affliction, diarrhea has laid low kings and common men, women, and children for at least as long as historians have recorded such fascinating trivia. It wiped out, almost, more soldiers in America's Civil War than guns and swords. In the developing world today, acute diarrhea strikes more than one billion humans every year, and leaves more than five million dead, usually the very young. Diarrhea remains one of the two most common medical complaints of humanity. "Frequent passage of unformed watery bowel movements," as described by Taver's Cyclopedic Medical Dictionary, diarrhea falls into two broad types: invasive and non-invasive. From bacterial sources, invasive diarrhea, sometimes called "dysentery," attacks the lower intestinal wall causing inflammation, abscesses, and ulcers that may lead to mucus and blood (often "black blood" from the action of digestive juices) in the stools, high fever, "stomach" crams from the depths of hell, and significant amounts of body fluid rushing from the patient's nether region. Serious debilitation, even death, can occur from the resulting dehydration and from the spread of the bacteria to other parts of the body. Non-invasive diarrheas grow from colonies of microscopic evil-doers that set up housekeeping on, but do not invade, intestinal walls. Toxins released by the colonies cause cramps, nausea, vomiting, and massive gushes of fluid from the patient's lower intestinal tract. Non-invasive diarrhea carries a high risk for dehydration.

单选题—Do you like working as a waiter? —Yes, but I get fired______the whole day.

单选题The student was worried about the job interview ______ he was well pre pared.

单选题In the city election, Jill was the only ______.

单选题He has just taken an examination ______ chemistry. A. for B. about C. on D. in

单选题Mary does not read newspapers; she reads Shakespeare, ______.

单选题Splendid ______ the architecture of Manhattan with its one hundred and more skyscrapers.

单选题The manager was told when he was______, that his was a pressure job.

单选题The salary of an engineer is much higher______.

单选题The first thing George did at the training school was ______.

单选题We all know that it is very hard to______him to give his plan up.

单选题 北京这座古城是中国古代科学技术和文化艺术高度发展的杰作。几个朝代的帝王在这个龙脉宝地(precious royal place)君临天下，并修建了雄伟壮观的长城、集全国能工巧匠之智慧的故宫、集天下园林之大成的圆明园(Yuanmingyuan Park)以及保留最完整的古代祭天建筑群(flocks of the sacred buildings)——天坛。北京是中国皇家园林与宫殿建筑的代表，是凝聚中华文明精髓的世界文化遗产。

单选题Blutt is near ______.

单选题______ you were busy, I wouldn't have bothered you with my questions. A. If I realized B. had I realized C. Did I have realized that D. As I realized

单选题Napoleon was ______at the battle of Waterloo in 1815.

单选题The father writes in his will that every son and daughter _______ a share of his property.

单选题Would you eat a bacon, lettuce and love apple sandwich? You probably have eaten many of them. Love apple was the name used many years ago for the tomato. The tomato is originally an American plant. It was found in South America by early Spanish explorers. The word tomato comes from the native Nahuatl word tomatl. But when it moved north, the plant earned a different name. Remarkably, the settlers in North America thought it was poisonous. They believed that to eat it was surely to die. It was said that deserted suitors would threaten to eat a tomato to cause their coldhearted lovers-regret. Because of this legend, the settlers called the tomato a "love apple." While people enjoyed other native plants such as corn and sweet potatoes, everyone avoided the tomato. No one knows who first dared to eat a tomato. Perhaps someone was brave enough, or lovesick enough, to try out the truth of the rumors. Of course, whoever ate this fruit was perfectly safe. No one died from eating a love apple. Still, it was many years before the people fully believed that the tomato was a safe, and even good food. But its use did become common, and the plant was sent across the ocean to become part of many traditional European dishes.

单选题 Diabetes upsets the ______ of sugar, fat and protein.