单词：universal time coordinate (utc)
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SECTION 1: LISTENING TEST (30 minutes) Part A: spot Direction Directions: In this part of the test, you will hear a passage and read the same passage with blanks in it. Fill in each of the blanks with
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This is Scientific American's 60-Second Science. I'm John Matson. Got a minute? In a laboratory vault outside Paris is a small cylinder of platinumiridium alloy that serves as the standard for all mass measurements worldwide. By an 1889 international
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6.DISAPPEARING THR0UGH THE SKYLIGHT Osborne Bennet Hardison Jr. 1 Science is committed to the universal. A sign of this is that the more successful a science becomes, the broader the agreement about its basic concepts: there is not a separate Chinese
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Each year, scientists work to develop a unique influenza vaccine to protect people against the strain expected in the coming flu season. Mutations in the virus mean that last year's vaccine probably won't protect against this year's flu variety. Now,
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The White House has expressed confidence that the U.S. Supreme Court will uphold President Barack Obama's landmark health care reform law as constitutional. After the Supreme Court heard the final legal argument on the health care law, a White House
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