题目内容
（请给出正确答案）
Why does the professor say this？
A．The students are late to class.
B．The students are quite clam.
C．The students must stay after class.
D．The students are too noisy.
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A、the occurrence
B、the mind
C、the matter
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[ ] |
| A. since that B. after that C. then that D. now that |
A、Students sometimes waste too much time at college.
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C、Students are often unrealistic and unprepared.
D、Students will get more chances to find a job.
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B、They run up and down the back and protect the spinal cord, where many of the major nerves are located.
C、The body is supported and given shape by bones.
D、The red marrow produces the yellow blood cells used throughout the body to transport oxygen, while the red marrow consists of fat cells.
A、The blood is pumped into the right ventricle and to the pulmonary artery to be sent to the lungs where carbon dioxide is removed and oxygen is added.
B、During the systole, oxygenated is pumped out of the right ventricle into the aorta and from there through the veins to all organs of the body.
C、There are four chambers which are made up of several layers of smooth muscles.
D、The heart is roughly the size of the your fist.
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