1. (2022九上·温州开学考) 阅读短文，回答问题

It's raining plastic! No, plastic bottles and bags are not dropping down from overhead. But plastic is in raindrops. A study by the U. S. Department of the Interior and the U. S. Geological Survey showed tiny pieces of plastic in rainfall in Denver and Boulder, Colorado. Scientists couldn't see the plastic until they put the rainwater they collected under a microscope. Once they did that, they found tiny pieces of plastic in 90 percent of the rain samples.

▲ It's a problem all around the world. Scientists haven't figured out just how widespread plastic pollution is, but they think that microplastics have probably find their way into every part of the environment. And just because we can't see the plastic doesn't mean it's not there. Scientists have found tons of plastic in the oceans, as well as in sea animals and plants. Even the human body can't resist microplastics.

No one's certain how microplastics have gotten all over the place. But really, it's no secret that we use a lot of plastic. It's commonly found in packaging, bags, electronics, and even in some of our clothes. Scientists think little pieces of plastic may be breaking off every time when we wash our clothes or just use something that contains plastic. That just may be how the rain samples in the study ended up containing so much of plastic.

OK, so there's a lot of plastic. Is it bad for us? Scientists are still studying the long-term effects of plastic exposure on people. But there's some research that suggests it may be harmful. In one study, microplastics were fed to mice, and they messed up the mice's gut microbiomes. Scientists know that when people's gut microbiomes are messed with, they are more likely to develop diseases like obesity and type 2 diabetes.

Sounds like we should all just avoid plastic to be on the safe side. That's easier said than done. Plastic is everywhere. It's impossible to avoid completely. Experts say we can reduce our exposure to plastic by limiting the amount of plastic products we use every day and by not washing our clothes too much. Both of those shed plastic into the environment. Still, there's a long way to go.

1. （1） Through the study, scientists found that     .

   A . three cities in the US are raining plastic B . we could find plastic in all the rain samples C . microplastic can't get into human bodies D . plastic pollution is already a serious problem
3. （2） Which of the following can be put in  ▲  in Paragraph 2?

   A . What a useful study it is! B . It's not a problem in America. C . It's cool to find plastic in raindrops. D . Let's see what the problem really is.
5. （3） Which of the following is TRUE according to the passage?

   A . Microplastics are harmful to humans but do no harm to mice. B . Exposure to plastic will make people develop type I diabetes. C . There is much more plastic in our environment than we can see. D . Scientists have found out why there is so much plastic in our life.
7. （4） What can we infer from the last paragraph?

   A . Experts will find ways to avoid plastic completely soon. B . It's easy for people to avoid plastic to be on the safe side. C . We need to wash our clothes to keep the environment clean. D . Using fewer plastic bags helps us reduce exposure to plastic.