I 次のそれぞれの英文を完成するために, 空所に入る最も適切なものを (A)~(ID) より選び, その
記号をマークせよ。
1. Once it is in the ocean, various factors including ( ① ) action break down
plastic waste into( ② ) pieces, often under one-fifth of an inch in diameter.
These so-called micro-plastics are spread throughout the oceans and have been
found in ( 3 ) areas of the world, from Mount Everest, the highest mountain, to
the Mariana Trench, the deepest ( ④ ) of the ocean.
(A) small
(B) part
(C) all
D) wave