How time flies! Ten years ________ passed

A . Bid B . To bid C . Bidding D . To be bidde

A . Bid B . To bid C . Bidding D . To be bidde

A . what B . as C . that D . tha

(24) A．This book is worth 30 dollars now. B．I'm surprised to find this book cost 10 dollars last year. C．It will cost you three dollars to get this book this year. D．This book is 10 dollars each if you buy three.

A．that B．when C．since D．as

Researchers have learned that the slapping noise pigeons make when they suddenly take off is the sound of super charged lift. They call it the "clap fling" effect. Here at SRI International scientists try to duplicate the pigeons' thrust. A flashing strobe reveals the secret. Scott Stanford, a scientist at SRI, says, You re looking at the clap fling effect, where the two wings will come together and peel apart 【C2】______ each other, thus augmenting lift 【C3】______ drawing air from the top to the bottom. " This mechanical bug won't get off the ground. 【C4】______ its flapping wings demonstrate a potential propulsion system for robotic birds: man-made rubbery muscle. Roy Kornbluh works at SRI. "There, I'm turning the voltage on and off, and you can see when the voltage is on, the material is larger 【C5】______ when the voltage is off." Super computers show high-speed airflows over supersonic aircraft. But scientists have only begun to see how air flows 【C6】______ really low speeds. Professor Max Platzer of the Naval Postgraduate School, says, "The flapping wing is generating a thrust, this way, this is the basic physics of the phenomenon." It's pelicans--not pigeons--the Navy is looking at. The Navy is looking at the smooth easy flight of pelicans low over water--called "ground effect." Researchers at the Naval Postgraduate School are trying to imitate the pelican's efficiency. Assistant Professor Kevin Jones of the Naval Postgraduate School says, " 【C7】______ flapping the wings, symmetrically, we're 【C8】______ effect imitating ground effect. We now have the same feature a bird sees when it's flying, over a ground plane." An electric motor drives the flapping wings. Researchers here are working 【C9】______ ways to beam power to the tiny bird. David Jenn of the Naval Postgraduate School says, "There's no battery inside of here, so we're going to set this inside the radar beam, and the energy is extracted from the radar beam and will be used to propel the motor." Scientists are learning it's one thing to build an airplane, 【C10】______ quite another to build a bird. 【C1】______

A．$3.57 B．$6.43 C．$10 D．$15

A．A.Accrued for over the year and charged to maintenance expenses B．B.Provided for in advance and charged to maintenance expenses C．C.Capitalised and depreciated over the period to the next overhaul D．D.Charged to profit or loss when the expenditure takes place

A．25% B．32% C．7%

A．taught B．was teaching C．had taught D．would teach

A:对 B:错

Just before dawn, there was further trouble.Amelia noticed flames coming from the engine.Would she be able to reach land？ There was nothing to do except to keep going and to hope. In the end, Amelia Earhart did reach Ireland, and for the courage she had shown, she was warmly welcomed in England and Europe.When she returned to the United States, she was honored by President Hoover at a special dinner in the White House.From that time on, Amelia Earhart was famous. What was so important about her flight？ Amelia Earhart was the first woman to fly the Atlantic Ocean alone, and she had set a record of fourteen hours and fifty-six minutes. In the years that followed, Amelia Earhart made several flights across the United States, and on each occasion she set a new record for flying time.Amelia Earhart made these flights to show that women had a place in aviation and that air travel was useful. (1).Her engine went wrong when Amelia Earhart was flying alone from North America to England.() A.T B.F (2).When Amelia Earhart saw flames coming from the engine, she changed her direction and landed in Ireland.() A.T B.F (3).According to the passage, Amelia Earhart's reason for making her flights was to show that aviation was not just for men.() A.T B.F (4).Amelia Earhart was the first woman who succeeded in flying across the Atlantic Ocean alone.() A.T B.F (5)."A Dangerous Flight from North America to England would be the best title for the passage.() A.T B.F

A．was B．were C．is D．have been

A．Accrued for over the year and charged to maintenance expenses B．Provided for in advance and charged to maintenance expenses C．Capitalised and depreciated over the period to the next overhaul D．Charged to profit or loss when the expenditure takes place