单选题It looks like rain. You______go out and watch TV at home.

单选题I ______ on seeing the manager. The service in this hotel is terrible.

单选题The storm sweeping over this area now is sure to cause ______ of vegetables in the coming days.

单选题The oil must have been used up, ______ the light went out. A. because B. for C. since D. as

单选题It is ______ ! Would you like to go out for a walk?

单选题The manager required that all the cocoa ______ to Shanghai the next day.A. would be deliveredB. should deliverC. might be deliveredD. be delivered

单选题—I think I'm coming down with a bad cold. —______.

单选题The world is known to us through many senses, not just hearing, smell, vision, and at close range, touch and taste. Our skins let us know whether the air is moist or dry, whether surfaces are wet without being sticky or slippery. From the uniformity of slight pressure, we can be aware how deeply a finger is thrust into water at body temperature, even if the finger is enclosed in a rubber glove that keeps the skin completely dry. Many other animals with highly sensitive skins, appear to be ahle to learn still more about their environment. Often they do so without employing any of the five senses. By observing the capabilities of other members of the animal kingdom, we come to realize that a human being has far more possibilities than are utilized. We neglect ever so many of our senses in concentrating on the five major ones. At the same time, a comparison between animals and man draws attention to the limitations of each sense. The part of the spectrum (光谱) seen by color- conscious man as red is non-existent for honey-bees. But a bee can see far more in flowers than we, because the ultra-violet (紫外线) to which our eyes are blind is a stimulating part of the insect's spectrum, and for honey-bees at least, constitutes a separate one.

单选题(The harder) he tried, (the most failures) he (suffered in) his early days (as a writer).

单选题______ by a large audience, he felt very nervous and didn't know what to say. A. Watching B. Watch C. Watched D. Having watched

单选题When we have dinner very late we don"t wash up ______ the next morning.

单选题______a teacher, one must first be a pupil.

单选题I am ______ of your stupid questions.A. annoyedB. worriedC. angryD. tired

单选题We all know that DNA has the ability to identify individuals but, because it is inherited, there are also regions of the DNA strand which can relate an individual to his or her family (immediate and extended), tribal group and even an entire population. Molecular Genealogy(宗谱学) can use this unique identification provided by the genetic markers to link people together into family trees. Pedigrees(家谱) based on such genetic markers can mean a breakthrough for family trees where information is incomplete or missing due to adoption, illegitimacy or lack of records. There are many communities and populations which have lost precious records due to tragic events such as the fire in the Irish courts during Civil War in 1921 or American slaves for whom many records were never kept in the first place. The main objective of the Molecular Genealogy Research Group is to build a database containing over 100,000 DNA samples from individuals all over the world. These individuals will have provided a pedigree chart of at least four generations and a small blood sample. Once the database has enough samples to represent the world genetic make-up, it will eventually help in solving many issues regarding genealogies that could not be done by relying only on traditional written records. Theoretically, any individual will someday be able to trace his or her family origins through this database. In the meantime, as the database is being created, molecular genealogy can already verify possible or suspected relationships between individuals. "For example, if two men sharing the same last name believe that they are related, but no written record proves this relationship, we can verify this possibility by collecting a sample of DNA from both and looking for common markers (in this case we can look primarily at the Y chromosome(染色体)," explains Ugo Perego, a member of the BYU Molecular Genealogy research team.

单选题He didn't come yesterday. He ______ busy working in the lab.A. must beB. would have beenC. must have beenD. would be

单选题Customer: I want to send a small parcel to Canada. Clerk: ______ Customer: What's the difference between the rates? My parcel weighs 248 grams.

单选题Student A: May I use your computer this afternoon? Student B: I"m sorry, but I have to finish typing this term paper today. Student A: ______

单选题I (think) I (would enjoy) the movie we went to last night even more (if I had) read the book before (seeing) it.

单选题(Giving the opportunity), this (highly intelligent) child will become (whatever) his parents wish him (to be).

单选题The novel ended happily, and the young couple was married ______.