单项选择题

Children in hospital usually turn to ______in order to catch up with their school work.

A．hospital teachers
B．schoolmates
C．parents
D．school teachers
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单项选择题
Which of the following is NOT mentioned as a reason that songbirds molt in the late summer
A．Fewer predators are in the woods.
B．The weather is still warm.
C．The songbirds have finished breeding.
D．Food is still available.
单项选择题
According to the passage, which of the following statements is NOT true
A．Although birds preen, the feather wears out.
B．Two processes are involved in molting.
C．When most feathers have been replaced, then the molt is completed.
D．A bird seems unwell when molting.
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