题目列表(包括答案和解析)
When we _______the railway station, the train _______for 5 minutes.
|
A.got to, had been away |
B.reached, had left |
|
C.arrived, has been away |
D.arrived at, has left |
When we _______the railway station, the train _______for 5 minutes.
| A.got to, had been away | B.reached, had left |
| C.arrived, has been away | D.arrived at, has left |
1.The film was ___________ __________ a true story.
这部电影是以一个真实的故事为基础。
2.They will stand by you ________ ______ you don’t succeed.
你即使不成功,他们也会支持你的。
3.When we _________ ________ the numbers, we realized we had spend too much.
当我们把数字加起来,我们意识到我们花太多钱了。
4.Mother is busy preparing dinner __________ ___________.
妈妈现在正忙着做饭。
5.The problem is how we can _______ ________ _______ of the limited natural resources.
问题是我们如何才能充分利用有限的自然资源。
6.Computer is _________a more and more important _________ in our daily life.
电脑在我们的日常生活中正起着越来越重要的作用。
7.He made some spelling mistakes in his composition_________ _______ his carelessness.
他因粗心在作文中出了一些拼写错误。
8.Once she has _________ _______ her ________, nothing can change it.
她一旦下了决心,什么也不能使她改变。
9.________ _________ from college, we finally got the chance to take a bike trip.
大学毕业后,我们终于得到了一次骑自行车旅行的机会
The human body has hundreds of muscles. The three types are skeletal(骨骼的) muscles, smooth muscles and cardiac, or heart muscles. Each kind of muscle has a special job to do.
The skeletal muscles are attached to the bones; they actually hold the skeleton together. Strong cords, called tendons(肌腱), help connect these muscles to the bones. Skeletal muscles give us strength and allow us to move in many ways. If you look at skeletal muscles through a microscope, you will see that it has bands of fibers that look like stripes(条纹). These stripes are called striations. Skeletal muscles usually move because the brain has sent a conscious message to them telling them what to do. This is called voluntary movement.
Another type of muscle is smooth muscle. Unlike skeletal muscle, smooth muscle does not have striations. This is found in organs such as the stomach, the bladder(膀胱), the lungs and the eyes. Smooth muscles are smaller than the skeletal muscles and they move involuntarily. The brain tells these muscles what to do, but we aren’t even aware of it. For example, we don’t have to think about breathing or digesting food. The smooth muscles just do their jobs automatically. For this reason smooth muscles are sometimes called involuntary muscles.
Like smooth muscle, cardiac muscle also works involuntarily. It is a very thick muscle that is found only in the walls of the heart. Its job is to pump blood out of the heart and into blood vessels called arteries(动脉). The arteries help carry the blood to all parts of the body. When the cardiac muscles relax, they let blood back into the heart. Cardiac muscles have striations, just like skeletal muscles do.
【小题1】When we _______, the job is done by smooth muscles.
| A.close our eyes | B.kick a ball | C.hug our friends | D.lift a suitcase |
| A.both can move voluntarily |
| B.both are thick muscles |
| C.both are bigger than smooth muscles |
| D.both have stripes called striations |
| A.Heart muscles are very important because they give us strength and allow us to move. |
| B.The heart of human beings completely consists of heart muscle. |
| C.The skeletal muscles are connected to the bones by tendons. |
| D.Smooth muscle does its work without receiving message from the brain. |
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