010.
Good morning, this is Helen Green with this edition of Morning Hours on the air. Now if you've got nothing to do today, why not go to the ease part of the city and get digging. That's the message from No. 1 Senior High School, which is organizing a tree planting event near East Mountain.
No. 1 Senior High School is a member of the environmental group of the city. In order to improve the environmental education of its students and get more people organized, the school is planning to plant a total of 1,400 trees paid by the government over the next few days.
They are hoping to plant half of them today and they are looking for volunteers to come along and help. No experience is neccessary, as there will be experts to give directions and the equipment will be provided. But if you have any tree planting tools, please do bring them along in case of a lot of people come and want to start digging at the same time.
Every one is welcome to come along anytime between 10 and 4 o'clock. Because you will be working in the mountains, I don't think you need my advice of what sort of shoes or clothes you have to wear. And of course, gloves will be essential to protect your hands if you're actually doing the digging. So it could be really a nice day out for all the families. Enjoy your day.

答案解析：
(1) 正確答案為B。根據this is Helen Green with this edition of Morning Hours on the air.這是海倫·格林為您帶來的Morning Hours廣播節目。可知，這是一個廣播通知，因此B項正確。
(2) 正確答案為A。根據In order to improve the environmental education of its students and get more people organized為了加強對學生的環境教育，組織起更多的人，可知，這項活動的目的是加強人們保護環境的意識，因此A項正確。
(3) 正確答案為A。根據plant a total of 1,400 trees一共要種1400棵樹，而今天要hoping to plant half of them種一半，即700棵，因此A項正確。
(4) 正確答案為C。根據And of course, gloves will be essential to protect your hands當然，為了保護手，手套是必需的。可知，廣播者建議志愿者去種樹的時候帶上手套，因此C項正確。