正确答案: C

髓或髓腔

题目：禾本科植物茎中央为( )。

解析：C

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举一反三的答案和解析：

[单选题]The author used to think of her mother’s English as ______.

imperfect

[单选题]2008年12月16日，国家开发银行股份有限公司挂牌成立，成为我国第一家由政策性银行转型而来的商业银行。转型后的国家开发银行的主体业务是

贷款业务

[单选题]八达岭地区花岗岩从形成到出露所经历的地质过程依次是

岩浆侵入—地壳抬升—风化剥蚀—侵蚀搬运

[单选题]成熟的绒毡层细胞一般具双核或多核。( )

正确

[单选题]According to Paragraph 2, why may a person suddenly forget who has called?

He is probably interrupted by another task.

[单选题]所有植物细胞的细胞壁都具有胞间层、初生壁和次生壁三部分。( )

错误

[单选题]How many hours of housework did men do every week in the 1970s?

About y.

[单选题]We can learn from the passage that __

one's inability to speak up is culturally determined sometimes

[单选题]An air courier is a person who_________A .manages a business company in foreign countries

travels around the world with cheap tickets