单项选择题

How many students are either juniors or males or both（）

A. 678
B. 766
C. 948
D. 1,130
E. 1,312

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单项选择题

Making snow angels usually falls under the category of children’s winter recreation, but in early 2007, the process took on a whole new meaning. Almost 9,000 people gathered on the state Capitol grounds in Bismarck, North Dakota, to set a new world’s record for the most people making snow angels at one time. They were determined to break Michigan’s record of 3,784. Participants ranged from families with children to snowplow drivers. One woman was there to mark her 99th birthday! Kids of all ages flapped their arms in the snow and a young baby even made a snow angel by having her car seat spun in circles. In the context in which it appears, mark most nearly means （）

A. memorialize
B. remember
C. identify
D. define
E. celebrate

单项选择题

Human fascination with space began hundreds of years ago. That interest has not waned, and today, the Hubble Telescope orbits 375 miles above Earth, working nonstop to unlock the secrets of the universe. The Hubble uses state-of-the-art instruments to provide amazing views of the universe that cannot be matched by ground-based telescopes. The reason for this is that, from the ground, we look at stars and other objects in space through Earth’s atmosphere. Our atmosphere is full of clouds, dust, and pollution, which cause everything we see to shimmer and shake. This effect creates difficulty for scientists on the ground to make steady, accurate measurements of objects moving in space. With assistance from the Hubble Telescope, astronomers can pinpoint the location of faraway stars and galaxies, and measure the speeds and distances of astronomical objects with far greater precision. Astronomers may even one day tell us exactly when the universe began. The author suggests that steady,accurate measurenebts can be difficult to attain because.（）

A.scientists frequently introduce unnecessary comolications to simple situations.
B.Earth-based telescopes are insufficiently peecise due to atmospheric dust and pollution.
C.due to Earth's constant rotation,it is nearly impossible to pinpointexact distances in outer space.
D.most telescopes require regular repairmissions when their cameras aren't functioning properly.
E.astronomers are not yet able to tell us exactly when the universe began.