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【单选题】
2014年8月13日凌晨的英仙座流星雨为人们提供了一些令人惊叹的美丽画面。关于该场流星雨，下列说法正确的是______。
A.
英仙座流星雨基本在每年7—8月发生
B.
它是由坦普尔·塔特尔彗星的碎片坠落到地球大气层里造成的
C.
英仙座流星雨数量大，但是对非专业流星观测者来说并不是观测的首选
D.
英仙座流星雨的特点是速度快，在极盛年代数量很大，被称为“流星雨之王”
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【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars．The atmosphere again acts 【C1】______ our protective blanket on 【C2】______ ．Light gets...
A.
for
B.
with
C.
on
D.
as
【单选题】Space is a dangerous place, not only because of meteors(流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and...
A.
The Atmosphere and Our Environment
B.
Research on Radiation
C.
Effects of Space Radiation
D.
Importance of Protection Against Radiation
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【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars．The atmosphere again acts 【C1】______ our protective blanket on 【C2】______ ．Light gets...
A.
for
B.
with
C.
on
D.
as
【单选题】Space is a dangerous place, not only because of meteors(流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and...
A.
The Atmosphere and Our Environment
B.
Research on Radiation
C.
Effects of Space Radiation
D.
Importance of Protection Against Radiation
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