下列对染色体的叙述，不正确的是[ ] A．染色体是由DNA和蛋白

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问题选择题

下列对染色体的叙述，不正确的是[ ]

A．染色体是由DNA和蛋白质两种物质组成的

B．每条染色体上都有控制生物性状的成对基因

C．染色体在体细胞中是成对存在的，一条来自父方，一条来自母方

D．每种生物细胞内，染色体的数量是一定的

答案

答案：B

单项选择题 A1/A2型题

患者女，30岁。睁眼困难伴复视2年，晨轻暮重，休息后好转，下列检查有助明确诊断的是（）。

A.新斯的明试验

B.疲劳试验

C.胸腺CT

D.AChR抗体测定

E.椎管造影

听力题

小题1: What was the s ▲ of the car at the time of the accident?

小题2:He was sitting a ▲ a group of children, telling them a story.

小题3:The room is very dark. I can't see anything c ▲ without a light.

小题4:Kindness is the language that even the b ▲ can see and the deaf can hear.

小题5:Even children can understand the story because it's written in very s ▲ English.

小题6: This dictionary ▲ （包括）almost all the English verbs.

小题7:Cleaning the car is one of my least favorite ▲ （工作）.

小题8:Ann is ▲ （安排)a surprise party for Russell's birthday.

小题9:The best ▲ （治疗）for a cold is to rest and drink lots of water.

小题10:I ▲ （借给）my penknife to someone, but I can't remember who it was now.