We ______ here for three years.[ ] A. ha

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问题选择题

We ______ here for three years. [ ]

A. have been

B. have come

C. have came

D. came

答案

答案：A

选择题

—You___________ stop me.

—Even if you __________it, I won't allow you to swim across the river.

A．mustn’t; dare not do

B．may; dare not do

C．can; dare to do

D．needn't; dare do

填空题

雪碧是生活中常见的饮料，其中含有CO₂、H₂O和柠檬酸等物质．

①观察一瓶雪碧，未见气泡，打开雪碧瓶盖，会冒出大量气体，其原因是；

______

______．

②请用两种不同的方法探究雪碧中可能溶解的CO₂．将必要的实验步骤和现象填在下表中：