From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.
#31194
A
why
B
how
C
because
D
whether
推荐题目
I developed very slowly and it took nearly two hundred years I was built as an analytical machine by Charles Babbage.
#33100
A
before
B
after
C
long
D
short
_____ you are in a speech contest or you are giving a talk in class, a little preparation will make your presentation organized and dynamic.
#31939
A
Either
B
On condition that
C
No matter
D
Whether
Although he knew little about the large amount of work done in the field , he succeeded ____other more well-informed experimenters failed.
#80107
A
as
B
unless
C
what
D
where