______ the earth to be flat, many feared that Columbus would fall off the edge of the eart
A.Having believed
B.Believing
C.Believed
D.Being believed
A.Having believed
B.Believing
C.Believed
D.Being believed
The earth revolves a little more rapidly______it is closer to the sun.
A.whether
B.whereas
C.although
D.when
Aluminum is found on earth mostly in the form. of______.
A.pure metal
B.bauxite
C.gold
D.liquid
The article suggests that______.
A. our earth exists before the sun
B. how space formed
C. no one knows where the earth comes from
D. our earth used to be part of a high mountain on the sun
It can be learned from the passage that about four billion years ago ______.
A. the earth was in molten state
B. the earth surface temperature was above 100℃
C. the earth surface temperature was below 100℃
D. rain water could remain on the earth
The sun warms the earth, ______ makes it possible for plants to grow.
A.this
B.that
C.as
D.which
What's the author's attitude towards the waste of the earth's resources ?
A.Negative.
B.Positive.
C.Neutral.
D.Enthusiastic.
______ with the size of the whole earth, the highest mountain doesn' t seem high at all.
A.When compared
B.Compare
C.While comparing
D.Comparing