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【单选题】
银河系中心存在超大质量黑洞的证据来自于A.
视界面望远镜对银河系中心黑洞拍下的“照片”。
B.
对银河系中心附近恒星轨道运行的直接观测。
C.
来自心方向，因超大质量黑洞的存在对其背后恒星的遮挡和引力透镜效应 的观测 。
D.
来自于银河系中心黑洞本身的电磁辐射。
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举一反三
【单选题】Deserts and high mountains have always been a ________ to the movement of people from place to place.
A.
barrier
B.
fence
C.
prion
D.
jam
【单选题】以下关于企业文化的认识中,你认为正确的是
A.
每个企业都以不同的方式表现出了各具特色的企业文化
B.
企业文化不止关乎企业外在形象，还应把它归结为企业管理要素
C.
所谓建设企业文化，其基本任务就是广泛开展文艺、体育活动
D.
企业文化在一定程度就是企业的参观、旅游等福利政策
【简答题】配制滴定液的水应 或 ,应符合《中国药典》 项下的规定。
【单选题】In judging our work you should take into consideration the fact that we have been very busy recently.
A.
thought
B.
mind
C.
account
D.
memory
【单选题】听力原文：W: What have you been up to recently? M: Burning the midnight oil finishing my business proposal. My angel investor needs it by next Monday. Q: What can we learn from the conversation? (18)
A.
The man's car burned oil in the midnight.
B.
The man was busy with his business proposal.
C.
The man's investor has the business proposal.
D.
The man's investor is an angel.
【单选题】Have you ever been there by bus?
A.
taken a bus there
B.
gone there on bus
C.
went there on a bus
【单选题】Deserts and the high mountains have always been a ___ to the movement of people from place to place.
A.
barrier
B.
fence
C.
prion
D.
jam
【单选题】In judging our work you should take into consideration the fact that we have been very busy recently.
A.
thought
B.
account
C.
mind
D.
brain
【简答题】中国在哪次会议上明确提出“马克思主义的中国化”命题:
【单选题】当温度为 20 °C时,空气和水的运动黏度之比 v空气/v水 =15 ,则必有()。
A.
μ 水 < μ 空气
B.
μ 水 = μ 空气
C.
μ 水 > μ 空气
D.
水 > 空气
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