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【單選題】
質量為m的小球，從地面豎直上拋，上升的最大高度為H。不計空氣阻力，取地面為零勢能參考平面。在下降過程中，當它的動能是重力勢能的2倍時，其離地的高度是（ ）
A.
H/2
B.
H/4
C.
H/3
D.
2H/3
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舉報參考答案：
舉一反三
【單選題】The man we followed suddenly stopped ______whether he was going in the right direction．
A.
seeing
B.
having seen
C.
to see
D.
to have seen
【單選題】How did those who took part in the study perform when asked to recall small details?
A.
Smokers did the worst among the participants.
B.
Non-smokers could recall about half of them.
C.
Smokers could recall nothing at all.
D.
Those who gave up smoking did best.
【單選題】What have the Researchers discovered?
A.
Those who drank green tea can't develop “functional disability”.
B.
Green tea alone kept people agile as they grew older.
C.
How green tea might offer a buffer against disability.
D.
Green tea extracts (提取物) seem to increase leg muscle strength in older women.
【單選題】Which of the following might be the best title?
A.
Experiences from Different Travel Plans
B.
Travel Peaks in China's Tourist Sites
C.
Floods of People to the Forbidden City
D.
Problems with Travelling on Holiday
【單選題】According to the passage, the wonder we take for granted(認為理所當然) is________.
A.
our ability to use language
B.
the miracle of technology
C.
the amazing power of nature
D.
our ability to make noises with mouth
相關題目：
【單選題】The man we followed suddenly stopped ______whether he was going in the right direction．
A.
seeing
B.
having seen
C.
to see
D.
to have seen
【單選題】How did those who took part in the study perform when asked to recall small details?
A.
Smokers did the worst among the participants.
B.
Non-smokers could recall about half of them.
C.
Smokers could recall nothing at all.
D.
Those who gave up smoking did best.
【單選題】What have the Researchers discovered?
A.
Those who drank green tea can't develop “functional disability”.
B.
Green tea alone kept people agile as they grew older.
C.
How green tea might offer a buffer against disability.
D.
Green tea extracts (提取物) seem to increase leg muscle strength in older women.
【單選題】Which of the following might be the best title?
A.
Experiences from Different Travel Plans
B.
Travel Peaks in China's Tourist Sites
C.
Floods of People to the Forbidden City
D.
Problems with Travelling on Holiday
【單選題】According to the passage, the wonder we take for granted(認為理所當然) is________.
A.
our ability to use language
B.
the miracle of technology
C.
the amazing power of nature
D.
our ability to make noises with mouth
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