填空题

Leaves show different colors other than green in the fall because the carotenoids and anthocyanins are then______.

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单项选择题
A．She’s happy that the student center is getting more computers.B．She’ll let the man use her computer to do statistics assignments.C．She will take a statistics course in the student center soon.D．She’d like to buy a computer very soon.
A．She’s happy that the student center is getting more computers.
B．She’ll let the man use her computer to do statistics assignments.
C．She will take a statistics course in the student center soon.
D．She’d like to buy a computer very soon.
填空题
The leaves of evergreens can survive the winter because they are ______and fluid inside their cells contains cold-resisting substances.
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