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题目内容
（国家开放大学理工英语）
It is called solar cooker, a newly designed cooking device and there are many kinds of solar cookers _______.
单选题 (10 分) 10分
A.
convenient
B.
useful
C.
available
单选题 (10 分) 10分
A.
convenient
B.
useful
C.
available
参考答案