题目内容
（请给出正确答案）
A．Because they can keep people away from the natural world.
B．Because they may help preserve more natural land.
C．Because they can increase productivity.
D．Because they may not produce pollutants.
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| 阅读理解。 |
| These are instructions for making invisible ink using baking soda. Difficulty: Easy Time required: A few minutes What you need: Baking soda Paper Water Light bulb Paintbrush Measuring cup Purple grape juice Here's how: There are at least two methods of using baking soda as invisible ink. Mix equal amounts of water and baking soda. Use a paintbrush to write a message onto white paper, using the baking soda solution (溶液) as "ink". Allow the ink to dry. One way to read the message is to hold the paper up to a heat source, such as a light bulb. The baking soda will cause the writing in the paper to turn brown. The second way to read the message is to paint over the paper with purple grape juice. The message will appear in a different color. Tips: If you are using the heating method, avoid igniting (点燃) the paper. Baking soda and grape juice react with each other in an acid-base (酸碱) reaction, producing a color change in the paper. Grape juice concentrate (浓缩物) results in a more visible color change than regular grape juice. |
| 1. ______ is not needed for making invisible ink. |
| A. Baking soda B. Paper C. Water D. Ink |
| 2. What's the function of the paintbrush？ |
| A. To draw a picture. B. To write a message onto the white paper. C. To allow the"ink" to appear. D. To help the"ink" dry. |
| 3. Why will the message appear in a different color in the second way to read the massage？ |
| A. Because there is enough grape juice. B. Because baking soda reacts with grape juice. C. Because of the use of water. D. Because of the special paper. |
| 4. From the process, we can know that making invisible ink is ______. |
| A. very hard B. not difficult C. a little difficult D. not easy |
A、introduced
B、witnessed
C、included
D、proposed
A、perceive
B、pursue
C、diagnose
D、interpret
A、An existing brochure stored in the company’s content management system
B、A printed copy of ISO standards for medical devices
C、Statistics about social media used in a published article
D、Your firsthand experience with a project
A、An online discussion forum
B、Your interview transcript
C、A published white paper
D、An operating manual
A、Citation styles vary in different disciplines and fields.
B、Technical writers can use up to three citation styles in one document.
C、We should never cite a whole paragraph.
D、Both direct and indirect quotations require the use of quotation marks.
A、Informing everyone on side about your presence.
B、Getting permission before the observation.
C、Taking notes while on site.
D、Keeping records of date, time of day, and duration of the observation.
A、Arriving the interview site a bit earlier than the appointment time.
B、Chatting informally with the interviewee prior to the interview.
C、Making comments and judgment when taking notes during the interview.
D、Sending a thank-you email to the interviewee after your meeting.
A、educational purpose
B、non-commercial use
C、international audience
D、internal use
A、planning and developing new content
B、researching and selecting materials
C、receiving and storing information
D、copying and converting existing content
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