【名词&注释】
打电话(ring up)、直升飞机(helicopter)、来自于(comes from)、氢气球(hydrogen balloon)、应当是(should be)
[单选题]流体的流速越大，压强越小．下列现象中，可用这个原理来解释的是( )
A. 氢气球离开手后升向高处
B. 直升飞机悬停在空中
C. 人能够漂浮在死海海面上
D. 船只并排航行易发生碰撞事故
查看答案&解析
举一反三：
[单选题]27． From the passage we know that fresh water doesn't come from________ ．
A. rivers
B. lakes
C. underground
D. the sea
[单选题]16．
A. am
B. is
C. be
D. are
[单选题]22． They stayed together for________
A. one week
B. two weeks
C. three weeks
D. five weeks
[单选题]13．
A. after
B. before
C. unless
D. if
[单选题]Please _________536-6781．
A. meet
B. call
C. look
D. have
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