Fraser Island is in Queensland，Australia，about 200 kilometers north of Brisbane．It is about 120kilometers long and 240 kilometers wide．It is a very important island because it is completely made of sand．In fact，it is the largest sand island inthe world．There is no airport on the island，but there is a longbeach along the east coast．Planes arrive and leave from here．
The sand makes unusual shapes．There are hills made of sand called sandblows．Nothing grows on them．
They move one or two meters a year from the northwest towards the southeast of the island，getting bigger and bigger．At other places on the island，such as Rainbow Gorge，The Cathedrals and Red Canyon，the sandy rocks have different colors．Sometimes the rocks areso brown that they turn the sea brown，like coffee．
Surprisingly，the sandy island has a lot of different plants and animals．There are dark forests-eucalyptus woods，beautiful flowers and over a hundred lakes．There are many kinds of birds，like owls and curlews．There are many animals there，too，such as crocodiles，flying foxes and wild dogs called dingoes．
About 500，000 people visit the island every year to see the island's beauty and nature．People enjoy camping and hiking（徒步）there．Unluckily，the visitors create problems．They damage plants and frighten animals．Their sun cream（防晒霜）makes the water dirty．So it isnecessary to manage the visitors．For example，people may not use motor boats or go fishing inthe lakes，and they need official papers to drive there．
43．The passage is mainly about
．
A．the shape of Fraser Island
B．nature on Fraser Island
C．the history of Fraser Island
D．daily life on Fraser Island
44．From Para.1we know
．
A．how large Fraser Island is
B．Fraser Island is the largest island
C．many people live on Fraser Island
D．people will build an airport there
45．The underlined word"They"in Para.2refers to（指）the
．
A．unusual shapes
B．sandy hills
C．sandy rocks
D．different plants
46．From the 3rd paragraph we can infer（推断）that
is a kind of plant．
A．eucalyptus
B．owl
C．curlew
D．dingo
47．Visitors may not be allowed to
on Fraser Island soon．
A．camp and hike
B．go fishing in the sea
C．wear sun cream
D．drive without official papers．