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

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

出自：国家开放大学理工英语

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