1. (2024·花都模拟)  阅读理解

We have found plastic in the ocean and in animals like birds, fish and whales. But for the first time, scientists have found plastic in human poop (粪便), USA Today reported. 

The finding came from a study led by scientists from Environment Agency in Austria. The researchers followed eight healthy volunteers from different parts of the world. The volunteers wrote down what they ate for a week and then provided a poop sample for testing. 

Scientists found nine different types of plastic in the samples, according to the study. An average of 20 small plastic particles (颗粒) were found in every 10 grams of poop. The particles measured between 50 to 500 micrometers. 

"The smallest plastic particles are able to enter the bloodstream, the lymphatic system (淋巴系统), and may even reach the liver (肝脏)," Philipp Schwabl, who took part in the research, said to the Guardian.

However, the scientists aren't sure if this plastic is harmful to humans. They're not sure how the plastic got in the volunteers' bodies, either. But most of the volunteers said they drank from plastic bottles and also ate seafood that could include plastic from ocean pollution.

In fact, plastic is everywhere around us. Every year, an average of 8 million tons of plastic waste goes into the oceans, according to National Geographic. There, sunlight and waves break the plastic items down to the size of grains of rice. Most of the particles stay in the ocean. Others can spread into the soil and air. Could plastic in the air fall onto food and get into the human body?

Previous studies may also give us a clue. According to USA Today, 90 percent of sea salt sold globally contains plastic. And even some tap water has been found to have tiny plastic particles in it. 

1. （1） According to USA Today, what was recently discovered?

   A . Plastic pollution is worse than ever. B . Sea Salt is not safe to eat anymore. C . Plastic has been found in human poop. D . Animals like birds or fish may eat plastic.
3. （2） What do we know about the study from Environment Agency?

   A . The volunteers kept a record of what they ate for a week. B . It proved that ocean pollution has become rather serious. C . Scientists from the USA followed eight healthy volunteers. D . Nine plastic particles were found in the volunteers' poop samples.
5. （3） Paragraph 4 is written to tell us that ____. 

   A . plastic can harm the lymphatic system. B . plastic particles can be a few different sizes. C . plastic particles can exist in everyone's body. D . plastic particles can reach many parts of our bodies.
7. （4） What's the purpose of this passage?

   A . To ask people to eat healthy food. B . To ask people to reduce using plastic. C . To ask people not to throw plastic bags into the sea. D . To ask people to keep the animals away from plastic.