__________ is it from here to Yangzhou Museum— About 20 minutes by bike.

He’s not a perfect child. He sometimes talks back ____ his parents talk with him.

下列各句中，加点词语不全存在古今异义的一项是 （3分）

Just like fingerprints, each person’s DNA is ________unless he has a twin.

would you please buy me an MP5 player— If you can help do some housework the whole vacation，you ____ have one asa reward