单选题Camels have extra, almost transparent, eyelids through which they can see in sandstorms.A additional B invaluable C protective D sensitive

单选题

Camels have extra, almost transparent, eyelids through which they can see in sandstorms.

additional

invaluable

protective

sensitive

正确答案： B

解析：
句意：骆驼有额外的、几乎透明的眼睑，使它在暴风沙里也能看见。extra额外的，附加的。additional与之同义。invaluable无价的，非常贵重的。protective保护的。sensitive敏感的。

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