________there is sunshine, there is life.
A.Before
B.Where
C.For
D.Because of
A.Before
B.Where
C.For
D.Because of
but _______________ quantities of radiation from the sun are
[A] soon
[B] well
[C] much
[D] possible
Put ondark glasses or the sun will _____________ you and you won’t be able to see.
A) discern B)distort
C) distract D) dazzle
sun is bad for the skin.
(A) exposure B) extension (C) exhibition (D) expansion
The atmosphere again acts our protective blanket on _____
[A] stars
[B] sun
[C] earth
[D] space
A.newClass().load("sun.jdbc.odbc.JdbcOdbcDriver")
B.newClass().forName("sun.jdbc.odbc.JdbcOdbcDriver")
C.Class.forName("sun.jdbc.odbc.JdbcOdbcDriver")
D.Class.Load("sun.jdbc.odbc.JdbcOdbcDriver")
We all __________________ radiation here on earth from the sun, from cosmic rays and from radioactive minerals.
[A] receive
[B] accept
[C] bring
[D] catch
A.瞬时轨道平面与太阳始终保持固定取向的卫星
B. 对地球保持大致相对静止的卫星
C. 圆形及顺行轨道位于地球赤道平面上,并对地球保持相对静止的卫星
D. 运行周期等于地球自转周期的地球卫星