单选题In that country, there are two glass ______ and one chemical

单选题______ experiments on the laboratory, it started to rain heavily.

单选题After being tested in many ways, this newly-designed machine will______in the near future.

单选题When we design a building, we should think of the _______of the people with disabilities.

单选题Color is very important to most animals for it helps them to get along in the world. Color (21) to make an animal difficult for its enemies to (22) . Many animals match their (23) so well that as long as they do not move no one is (24) to see them. You probably have often "jumped" a rabbit. If you (25) , you know how the rab- bit sits perfectly still (26) you are just a few feet away. You (27) see the rabbit till it runs for its (28) matches very closely the place where it is (29) . Many times you may have walked past a rabbit (30) didn't run and you never knew it was there at all. One of the most usual color schemes that helps animals to keep (31) being seen, is a dark back and light underpants. If an animal is the same color all (32) , there is always a dark shadow along the animal's belly (腹部). (33) an enemy couldn't see the animal he could see this dark shadow. The shadow makes the animal (34) out to view. But if the belly is (35) than the rest of the animal, the shadow will not be noticed.

单选题I don't like this hat. Please show me ______.

单选题______ determines a good meal varies from country to country.

单选题Many students find ______ jobs during their summer holidays. A. contemptible B. temperate C. temporary D. contemporary

单选题He was found ______ one month after he was born.

单选题I' ve got ______ today.A. the bad toothacheB. a bad toothacheC. bad toothachesD. the bad toothaches

单选题When he was in junior high at fourteen, his intelligence was such that he______among undergraduates than among schoolboys.

单选题You cannot ignore the situation forever, one day you will have to ______ the consequences of your act.

单选题What athletic events were held in the first thirteen Olympic Games?

单选题A ______ steel-making process is now being developed.

单选题 Children are sensitive to disapproval and adjust their behaviour ______.

单选题It is obvious that these small businesses are ______ need of technical support.

单选题While he was in the office he______ doing something to doing nothing.

单选题Florida's______ warm climate and plentiful rainfall make the state a center of citrus productions,

单选题The sun's heat warms the air and makes it move. This movement is called a wind. Different parts of the Earth receive different amounts of heat. Near the equator(赤道), the sun is overhead and heats the Earth intensely (强烈). Nearer the poles, the sun's rays strike the Earth at a low angle so the heat is not so intense. A lot of the earth's heat is reflected back into spaces, by the atmosphere, clouds, dust in the air and by water, snow and ice. So some parts of the Earth are warm and some are cold. Warm air tends to rise and creates areas of high pressure. As warm air rises, cold air flows in and replaces it. The greater the pressure difference is, the stronger the wind blows.