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问题 单项选择题 A1/A2型题

细胞周期能否启动进行细胞增殖，主要的调控点在（）。

A.G0期

B.G1期

C.S期

D.G2期

E.M期

答案

参考答案：B

解析：细胞周期顺利进行的主要调控点在G1期，它决定细胞是否通过G1期进入S期。

阅读理解

John and Sally are in the same school. Their home is far from school. They get up early in the morning and take a bus to school after breakfast. Sometimes they have lunch in the restaurant. John likes hamburgers and meat. But Sally likes vegetables and fruit. After lunch John goes to play volleyball and Sally goes to the classroom. She sings English songs or listens to the music.

根据短文内容，判断下列句子的正（T）、误（F）。

小题1:John and Sally go to different schools.

小题2:They go to school on foot every day.

小题3:They sometimes have lunch in the restaurant.

小题4:Sally’s favorite food is vegetables and meat.

小题5:Sally likes singing or listening to the music after lunch.
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俄罗斯 * * 普京在回答“您怎样看待苏联解体”时，引用俄罗斯家喻户晓的一句话说：“谁不为苏联解体而惋惜，谁就没有良心；谁想恢复过去的苏联，谁就没有头脑。”大多数俄罗斯人不想恢复“过去的苏联”，主要原因是苏联（   ）

A．综合国力不强

B．忽视科技文化的发展

C．与美国争夺世界霸权，造成经济困难

D．体制僵化，社会缺乏活力
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