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【简答题】
如图甲所示，手拉住绳子的一端，另一端系一重为 10N的物体．在手由图甲所示位置顺时针缓慢移动到图乙所示位置的过程中物体始终处于静止状态，则该过程中拉力大小变化情况为 （填“变大”、“变小”或“不变”）， 绳对重物做功情况为 （填“做功”或“不做功”），在到达图乙位置后手拉住绳子自由端向左匀速移动0.5m，该过程中拉力做 J的功（绳重及摩擦不计）．
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【单选题】What causes wind on top of hills and mountains?
A.
cool air rising while hot air sinks
B.
cool air and hot air hitting each other
C.
hot air rising while cool air sinks
D.
cool air and rain clouds
【简答题】A．lake B．river C．mountains D．hills
【单选题】They have to walk_________8 country parks and___________20 hills and mountains. [ ]
A.
up; up
B.
over; over
C.
through; over
D.
along; down
【简答题】Postcards to myself In 50 years fo traveling Colin McCorpuodale has visited every country in the world, except thtee, And everywhere he goes, he sends himself a postcard , He always chooses a postcard...
【简答题】[A]lake [ B] river [C] mountains [D] hills
【简答题】China's topography is varied and complicated, with towering mountains, basins of different sizes, undulating plateaus and hills, and flat, fertile ___________ .
【单选题】The highland zone is an area of high hills and mountains in the______of Britain.
A.
north and west
B.
north and east
C.
south and west
D.
south and east
【单选题】—Oxfam trailwalkers in Hong Kong have to climb________ twenty hills and mountains. —It’s really a tough hike.
A.
through
B.
around
C.
over
D.
along
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