As a writer, Bacon wrote the greatest tracts on education in the English language, that is . A: The Advancement of Learning B: The New Instrument C: Essays D: The New Atlantis

有关静脉使用rt-PA治疗急性脑梗死的研究有（） A: NINDS B: ECASS C: ATLANTIS D: EPITHET E: ACAS

2. The space shuttle Atlantis crew is scheduled to make their final landing around 6 a.m. Thursday also marks the 42nd ________ of man's first step on the moon.