正确答案: A

正确

题目：毛莨科植物多为有毒植物和药用植物，因其含有多种生物碱。( )

解析：A

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举一反三的答案和解析：

[单选题]数目固定，但在次生生长中可不断延长的初生射线为( )。

髓射线

[单选题]The passage in mainly about

what the result of the competition was

[单选题]

improvements

[单选题]BWhen people hear a president speak, they seldom think about others helping to shape the presentation（报告）. Today, however, presidents depend on writers such as J. Terry Edmonds to help them communicate（交流）effectively. Edmonds is the first African American ever to work as a full-time speechwriter for a U.S. president; he is also the first African American to serve as director of speechwriting for the White House. His is an all-American story of success.

Edmonds graduated from Morgan State University in 1967.

[单选题]下列有关线粒体和叶绿体的叙述，错误的是

线粒体和叶绿体为双层膜结构，其内膜中酶的种类相同

[单选题]人类活动会对生物多样性产生影响。以下措施中，有利于保护生物多样性的是 ( )

禁止游人进入自然保护区的核心地区，让生物自然繁衍

[单选题]What is one of the problems that David is facing now?

He is too young to get a credit card.