问题
选择题
火星和地球的距离约为34 000 000千米，用科学记数法表示34 000 000的结果是千米． [ ]
A．0.34×108
B．3.4×106
C．34×106
D．3.4×107
答案
答案：D
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火星和地球的距离约为34 000 000千米，用科学记数法表示34 000 000的结果是千米． [ ]
A．0.34×108
B．3.4×106
C．34×106
D．3.4×107
答案：D
完型填空：（共10分） John is a famous writer now. But he said he was not a ____1____ student when he was young. He was often late for ___2_____ and didn’t like doing his homework. Sometimes, he slept in class. He didn’t understand(理解) much ,____3____ he always thought he understood everything and made some jokes. One day the teacher ____4____ the students a question, “When Jack was ten years old, ____5____ brother Bob was twenty. Now Jack is fifteen and ___6___ is his brother Bob?” John said, “That’s easy. Bob is twice as old as Jack, so he is now thirty.” Another time, the _7____ in a science class asked, “When it thunders(打雷), ____8____ do we always see light before we ____9____ sound? “But, Miss,” said John quickly, “don’t you ___10____ our eyes are in front of our ears?
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