ADMICRO

Read the passage below carefully, and then choose the best answer:
Plants that Can Help You
We have already talked about some dangerous plants, but we don’t want to give anyone the wrong idea. Please don’t think that most plants are dangerous. The truth is that although some plants can hurt you, most are completely harmless. In fact, there are plenty of plants that are actually very useful to humans. That is why plants are so popular in Chinese medicine. Chinese medicine has been using plants for at least 4,800 years. One of the most popular plants in Chinese medicine is ginseng. Doctors of Chinese medicine believe that ginseng can help your lungs, clean your blood, and do many other things. Ginseng is also a source of energy. In fact, many modern energy drinks that you see in stores contain ginseng. In some parts of the US, there is a plant called lady fern. This is the plant you need if you have been stung by a bee, or if you have got a small burn or a cut. Lady ferns are great for making your skin feel better. All you have to do is roll one of its leaves and crush it in your hands. The juices inside the leaf will help your skin feel better. If you are ever hiking in Europe, look for a flower called tansy. This yellow flower is a natural insect repellent. You just rub it on your skin, and insects will leave you alone. Sage is one of the most useful plants in the world. Because it has so many uses, it is also quite valuable. Human beings have been using sage for a very long time. In Europe, before refrigerators existed, people often used sage to preserve food. Over the years, people have used sage to fight all kinds of health problems. Sage has been used to treat colds, stop muscle problems, and reduce swelling. There are all kinds of other things that people have used sage for. In fact, sage is so useful that it comes from the Latin word “salvere” which means “to be saved”.
7. The word “it” in paragraph 4 refers to __________

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