PAGE 第 4 页 共 5 页 Unit 3 课时跟踪检测（二） Word power, Grammar and usage & Task Ⅰ.单词拼写 1．We have a tight schedule for your brief (短时间的) visit. I hope you don't mind. 2．She originally (最初) thought of donating all of her organs to save others' lives, but failed to do it because of her serious illness. 3．The majority (多数) of students were in favour of the suggestion that they (should) go out for a picnic next Sunday. 4．Having taken the matter into consideration (仔细考虑) many times, we decided not to buy such an expensive car. 5．I've known him for years, and I trust his judgement (判断)． 6．The following is a summary (总结) of our conclusions. 7．According to the survey conducted (实施) by this university, only 18% are for the idea. 8．To be frank, I will choose teaching as my profession (职业) in the future. Ⅱ.选词填空 take ...into consideration， in brief， put ...in place， follow in the footsteps of ...， get burnt out 1．Don't worry.I have put everything in_place. 2．Don't work so hard, or you will get_burnt_out. 3．She works in education, following_in_the_footsteps_of her father. 4．Taking everything into_consideration,_the event was a great success. 5．We should, in_brief,_invest heavily in digital systems. Ⅲ.阅读理解 A A microscope (显微镜) is a useful instrument for observing small objects by producing a bigger image. The microscope shows details that cannot be seen by the naked eye (肉眼)． Before using the microscope, please read the instructions below. CAUTION： Microscopes are both easily broken and expensive and must be handled with care. 1．Always carry the microscope with two hands — one supporting the base and the other on the arm. 2．Avoid stretching the power cable of the lamp across a walkway. 3．Keep the stage clean and always use a glass slide for samples. To avoid breaking the glass slide when focusing, begin with the lens (镜头) close to the sample and gradually back off to focus. Keep the microscope covered to prevent the build up of dust while it is being stored. HOW TO USE THE MICROSCOPE： 1．Turn on the lamp. 2．Place a sample of what you wish to observe on a slide. 3．Move the mirror so it reflects (反射) light from the room up into the objective lens. When the mirror is in the correct position, a complete circle of light will appear when you look through the eyepiece. 4．Place your slide with the sample directly over the center of the glass circle on the stage. If it is a wet slide, be sure the bottom of the slide is dry. 5．With the LOW POWER objective lens placed over the slide, use the coarse focus knob (粗聚焦旋钮) to lower the lens to the lowest point. 6．Look through the eyepiece with one eye while closing the other eye. Slowly raise the lens until the focus is relatively clear. 7．Use the fine focus knob (精细聚焦旋钮)． 8．Without changing the focus knobs, switch to the HIGH POWER objective lens. Once you have switched to HIGH POWER, use only the fine focus knob to make the image sharp ... ...
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