Plastic is made from oil or other petroleum products and is used to create a wide range of things，from water bottles and car parts to children's toys and clothing.Over time，heat，weather，and even animal digestion break down plastic into smaller pieces，creating microplastics. Researchers are still trying to understand how much plastic we might be taking in or consuming through our food and drinks.Many studies have found traces （痕迹） of plastics in the human body.Tracey Woodruff，a researcher at the University of California，San Francisco，noted that microplastics have been discovered in almost all body tissues studied. In 2022，a World Health Organization report stated that there was no clear risk to human health from microplastics，based on the evidence available.However，since research on this topic is relatively new，the full impact of microplastics on human health remains vague.Some studies suggest that plastics can cause inflammation and other bodily changes，likely increasing the risk of heart attacks. To reduce exposure （接触） to microplastics，researchers suggest several steps.Remove your shoes before entering your home to prevent spreading microplastics indoors.Choose home-prepared foods，especially fresh fruits and vegetables.Avoid heating foods in plastic containers and choose metal or glass water bottles instead of plastic ones.These simple actions can help reduce your contact with these tiny，and harmful particles.（1）What is paragraph 2 mainly about？ ____ A．The rapid spread of microplastics.B．The forming process of microplastics.C．The benefits of plastics in various industries.D．The influence of plastics on the environment.（2）What does the underlined word "vague" in paragraph 4 probably mean？ ____ A．Uncertain.B．Obvious.C．Unchanged.D．Far-reaching.（3）What is recommended to reduce exposure to microplastics according to the text？ ____ A．Changing clothes after doing housework.B．Avoiding using plastic bags when shopping.C．Thinking twice before consuming processed foods.D．Replacing plastic containers with metal ones.（4）What's a suitable title for the text？ ____ A．Are microplastics harmful？B．Should microplastics be removed from our life？C．Joint effort is needed to deal with microplastics.D．Microplastics are becoming a tough problem.

       Microplastics，or tiny particles （微粒） of plastic that can be as small as one-thousandth of a millimeter，are found everywhere：in the ocean，in the air，and even in our food.Scientists have even discovered them in human body tissues like the heart，liver，and kidneys.While there's no clear evidence （证据） yet that microplastics harm human health，researchers are concerned about their possible effects.
       Plastic is made from oil or other petroleum products and is used to create a wide range of things，from water bottles and car parts to children's toys and clothing.Over time，heat，weather，and even animal digestion break down plastic into smaller pieces，creating microplastics.
       Researchers are still trying to understand how much plastic we might be taking in or consuming through our food and drinks.Many studies have found traces （痕迹） of plastics in the human body.Tracey Woodruff，a researcher at the University of California，San Francisco，noted that microplastics have been discovered in almost all body tissues studied.
       In 2022，a World Health Organization report stated that there was no clear risk to human health from microplastics，based on the evidence available.However，since research on this topic is relatively new，the full impact of microplastics on human health remains vague.Some studies suggest that plastics can cause inflammation and other bodily changes，likely increasing the risk of heart attacks.
       To reduce exposure （接触） to microplastics，researchers suggest several steps.Remove your shoes before entering your home to prevent spreading microplastics indoors.Choose home-prepared foods，especially fresh fruits and vegetables.Avoid heating foods in plastic containers and choose metal or glass water bottles instead of plastic ones.These simple actions can help reduce your contact with these tiny，and harmful particles.
（1）What is paragraph 2 mainly about？ ____
A．The rapid spread of microplastics.
B．The forming process of microplastics.
C．The benefits of plastics in various industries.
D．The influence of plastics on the environment.
（2）What does the underlined word "vague" in paragraph 4 probably mean？ ____
A．Uncertain.
B．Obvious.
C．Unchanged.
D．Far-reaching.
（3）What is recommended to reduce exposure to microplastics according to the text？ ____
A．Changing clothes after doing housework.
B．Avoiding using plastic bags when shopping.
C．Thinking twice before consuming processed foods.
D．Replacing plastic containers with metal ones.
（4）What's a suitable title for the text？ ____
A．Are microplastics harmful？
B．Should microplastics be removed from our life？
C．Joint effort is needed to deal with microplastics.
D．Microplastics are becoming a tough problem.