单项选择题

Questions 21—23 are based on a passage about cloning. You now have 15 seconds to read Questions 21—23.
What’s the big breakthrough with Dolly, the first cloned animal

A．She was a clone from an ordinary, adult cell.
B．She was the first normal and healthy cloned animal.
C．She was the way to the cloning of human beings.
D．She was a cloned animal with only mother.

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单项选择题

A．Check on what’s for dinner.B．Go running before they eat.C．Go to the lab briefly.D．See if they have lots of work.

A．Check on what’s for dinner.
B．Go running before they eat.
C．Go to the lab briefly.
D．See if they have lots of work.

单项选择题

The writer says that travel was important in the past because it ______.

A．was a way of spreading ideas
B．broke down political barriers
C．led to economic progress
D．made new ideas less schooling

Questions 21—23 are based on a passage about cloning. You now have 15 seconds to read Questions 21—23. What’s the big breakthrough with Dolly, the first cloned animal 您的浏览器不支持 audio 元素。

Questions 21—23 are based on a passage about cloning. You now have 15 seconds to read Questions 21—23.
What’s the big breakthrough with Dolly, the first cloned animal