下列有关细胞结构的叙述,不正确的是() A.胆固醇是细胞膜的重要成分 B.液泡主要存

题型:单项选择题

问题:

下列有关细胞结构的叙述,不正确的是()

A.胆固醇是细胞膜的重要成分

B.液泡主要存在于植物细胞中,中心体存在于动物和某些低等植物细胞中

C.植物细胞中只有叶绿体含有色素

D.硝化细菌没有线粒体,但能进行有氧呼吸

考点:细胞生物学细胞生物学综合练习细胞生物学综合练习题库
题型:单项选择题

任务型阅读。

Dear Mike,

      We got your letter yesterday. Yes, we can visit you at Christmas. We wanted to spend Christmas at home,

but now we are going to be with you. Jack will not be in school then.

      It is cold now in New York, but it doesn't matter. Sometimes we like the snow.

      We got our plane tickets. We will get to your city on the 18th. We will stay with you for two weeks. Is that

all right with you?

      We'll take our favourite diets, so we can have a nice Christmas dinner.

      See you soon.

                                                                                                                                                 Love,

                                                                                                                                     Mum and Dad

根据短文内容用适当的单词完成下面句子,每空一词。

1. This letter is from Mike's _____________.

2. In New York, it is ____________ now.

3. Mike has a brother called ____________. He is in school now.

4. Mike's parents will go to his city by ______________.

5. His parents will come back on ______________ 31st.

题型:单项选择题

无嗜睡作用的h,受体拮抗剂是()

A.马来酸氯苯那敏

B.阿司咪唑

C.富马酸酮替酚

D.雷尼替丁

E.赛庚啶

题型:单项选择题

到2006年6月,我国的移动电话使用总量跃居世界第一位,电话从奢侈品变成了日用品,这个现象不能说明的是()

A.我们在现代生活中越来越依赖现代通讯工具

B.改革开放后,我国的国民经济迅速发展

C.人们越来越重视生活质量的提高

D.中国疆域辽阔人口最多

题型:单项选择题

预测的连续性原理

题型:单项选择题

战略按按军事行动的目的可划分为:()

A.进攻战略

B.防御战略

C.扩张战略

D.自卫战略

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