单项选择题


A．as
B．having
C．when
D．while
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单项选择题
A．descriptionB．descriptionsC．prescriptionD．prescriptions
A．description
B．descriptions
C．prescription
D．prescriptions
单项选择题
Solar energy causes
A．less pollution than oil
B．more pollution than oil
C．the same pollution as oil
D．financial problem
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