正确答案: B

印度橡皮树叶片

题目：观察钟乳体的较好材料是( )。

解析：B

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举一反三的答案和解析：

[单选题]At the age of 29, Dave was a worker, in a small apartment near Boston and ______ what to do about his future.

living; wondering B． lived; wondering

[单选题]4 When does the bank close on Sa turday?

At l：00 pm

[单选题]相对原子质量：H 1 O16 S 32 Fe 561．下列实例与基因的作用无关的是

极端低温导致细胞膜破裂