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【单选题】
The stone in John's 'Rockpool' design is used
A.
for decoration.
B.
to switch it on.
C.
to stop water escaping.
举报
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Salvinia molesta plagues
A.
A forage grass
B.
B rice fields
C.
C coconut trees
D.
D fruit trees
E.
E water hyacinth
F.
F parthenium weed
G.
G Brazilian beetles
H.
H grass-scale insects
I.
I larval parasites