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Let's pretend we're sailing down the Rhine River on a pleasure boat. The Rhine is one of the main waterways of Germany, and the river traffic is heavy. It's interesting to watch the many boats going up and down the river. But the river traffic is not nearly so interesting as the beautiful scenery along the banks and hillsides. The boat is passing many old castles. We can see people working in the vineyards (葡萄园) on the hillsides. There are vineyards as far as the eye can see. Wine from the Rhine Valley is famous all over the world. Suddenly our boat slows down and begins to turn a little. We are coming to a sharp bend in the river. On our right we can see a rocky cliff over 400 feet high. At first it looks quite ordinary, but there is nothing ordinary about it. There are many stories, poems, and songs about the cliff. We are looking at the Lorelei. The someone on the boat begins to sing in German, the song of the Lorelei. It is a song about a beautiful siren (美女) who has lured many sailors to their deaths. The siren is supposed to sit on the rock combing her long golden hair and singing. The sailors who hear her forget to steer, and the current of river hurls their boats on the rocks and dashes them to pieces. Soon other people on the boat begin to sing. The beautiful song adds to special magic to the moment, and you begin to realize why so many people have made this trip down the Rhine to see the rock of the Lorelei. 1.The more interesting thing to those who are sailing down the Rhine River on a pleasure boat is      . A. to watch many boats going up and down the river B. to see the beautiful scenery along the banks and hillsides C. to hear a song about beautiful siren D. to see a beautiful siren combing her golden hair 2. Which of the following is famous all over the world? A. The Rhine River.                   B. The River Traffic. C. Wine from the Rhine Valley.          D. The Lorelei. 3. We can see a rocky cliff over 400 feet high      . A. on our right when coming to a sharp bend       B. on the Rhine hillsides C. from the Rhine Valley                 D. on the boat 4. The song of the Lorelei is about      . A. The Rhine wine B. a rocky cliff C. the beautiful scenery along the Rhine River D. a beautiful and dangerous woman genie
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【多选题】下列关于力的说法正确的是
A.
作用力和反作用力作用在同一物体上
B.
太阳系中的行星均受到太阳的引力作用 C 运行的人造地球卫星所受引力的方向不变 D.伽利略的理想实验说明了力不是维持物体运动的原因
【单选题】下面关于力的说法正确的是( )。
A.
作用力和反作用力是作用在同一物体上
B.
太阳系中的行星均受太阳的引力作用
C.
运行的人造地球卫星所受引力的方向不变
D.
伽利略的理想实验说明了力是维持物体运动的原因
【单选题】关于作用力和作用反力,下面说法正确的是 _____
A.
一个作用力和它的反作用力的合力等于零
B.
作用力和反作用力可以是不同性质的力
C.
作用力和反作用力同时产生、同时消失
D.
只有两个物体处于相对静止时,它们之间的作用力和反作用力的大小才相等
【单选题】关于作用力与反作用力的说法正确的是( ) 。
A.
作用力与反作用力作用在同一物体上
B.
作用力与反作用力分别作用在两个相互作用的物体上
C.
作用力与反作用力可以看成一平衡力系而相互抵消
D.
作用力与反作用力不一定作用在一条作用线上
【单选题】.关于作用力和反作用力正确说法是
A.
必为性质相同的力
B.
必为效果相同的力
C.
必为大小相等方向相反在同一直线上作用于同一物体的力
D.
作用时间必相等
【简答题】中国服饰的源流可上溯到原始社会旧石器时代晚期。山顶洞人遗址中发现磨制的( ) 和( )是目前关于中国服饰最早的实物证明。
【单选题】关于作用力和反作用力,下列说法正确的是( ) A .作用力反作用力作用在不同物体上 B .地球对重物的作用力大于重物对地球的作用力 C .作用力和反作用力的大小有时相等有时不相等 D .作用力反作用力同时产生、同时消失
A.
B.
C.
D.
D
【单选题】关于作用力和反作用力的说法正确的是()
A.
物体间发生相互作用时先有作用力,后有反作用力
B.
作用力和反作用力等值、反向,所以物体一定保持平衡
C.
人加速奔跑时,地对人的作用力大于人对地的作用力
D.
重力和弹力不可能是一对作用力和反作用力
【单选题】以下关于作用力和反作用力说法错误的是( )。
A.
大小相等
B.
方向相反
C.
沿同一条直线
D.
作用在不同物体上
【单选题】宫颈原位癌是指癌细胞
A.
侵及宫颈肌层
B.
限于粘膜下层
C.
侵犯宫腔
D.
限于宫颈鳞状上皮层
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