In the botanic garden we can find a（n）______of plants that range from tall trees to small flowers.
#4939
A
species
B
group
C
amount
D
variety
推荐题目
— Why are you so popular with your students?— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
#4683
A
as
B
that
C
if
D
which
Have you heard ______ news？The piece of _______ petrol is going up again!
#4937
A
the, the
B
不填，the
C
the, 不填
D
不填，不填
________ you understand the rule, you’ll find English easy to learn.
#4634
A
As
B
While
C
Once
D
Whether
______in the heart of Toronto is the Canadian National Tower, ______ is often called the CN Tower for short.
#4592
A
Located, where
B
locating, which
C
locating, where
D
located, which