Forests are very important for our planet. They give homes to wild animals, clean the air, and help to control the climate. Sadly, huge areas of forest are lost every year to fire, disease, and human activity. Planting new trees by hand is slow and hard work, so scientists have started to use a surprising new tool to help: the （ 1 ）.
A drone is a small flying machine that is controlled from the ground. To plant trees, special drones first fly over an area and make detailed maps of the land. Then they drop small balls into the soil, each one containing a seed and the food the young plant will need. （ 2 ）, a team using drones can plant far more trees in a day than a group of people working by hand.
Drones are especially useful in places that are difficult or dangerous for people to reach, such as steep hills or land that has just been burned. They are not a perfect answer, because not every seed will grow into a healthy tree. （ 3 ）, many experts believe that drones, together with traditional planting, can help forests recover much more quickly than before.
（1） 正解 1. drone
次段落以降が「ドローンとは飛ぶ機械で…」と説明する。題名どおり drone が正解。
（2） 正解 1. As a result
前で「種入りのボールを落とす」、後で「手作業より1日にずっと多く植えられる」と結果。As a result が正解。
（3） 正解 1. Even so
前で「すべての種が育つわけではない（完璧でない）」、後で「それでも専門家は役立つと信じる」と逆接。Even so（それでも）が正解。
stylish：おしゃれな
fashionable and attractive（流行に合っていて魅力的な）
landfill：埋め立て地
a place where waste is buried in the ground（ごみを地中に埋める場所）
repair：修理する
to fix something that is broken or torn（壊れた・破れたものを直す）
drone：ドローン
a small flying machine controlled from the ground（地上から操作する小型の飛行機械）
recover：回復する
to return to a normal or healthy state（正常・健康な状態に戻る）
tear：破れる
to pull apart or become damaged（引き裂ける、破れる）
practical：実用的な
useful and sensible（役に立ち理にかなった）
symbol：象徴
a thing that represents an idea（ある考えを表すもの）