有一旅客携带了30公斤行李从南京禄口国际机场乘飞机去天津，按民航规定，旅客最多可免费携带20公斤行李，超重部分每公斤按飞机票价格的1.5%购买行李票，现该旅客购买了120元的行李票，则他的飞机票价格应是（   ）．

阅读理解A

Babysitter Wanted

    Do you like children? Do you have free time in the afternoon? We need a babysitter for our son. He is five years old. Hours are 3:00 p.m. to 6:00 p.m. from Monday to Friday. Sometimes you have to work on the weekend. Pay is $10 each hour.

For the job, you will: Watch my son

    Read to him

    Play with him

    You will work at our house. We live in Fourth Road, near Fashion Clothes Store.

    Please call Heather on 0423-498892.

②2H₂（g）+SO₂（g）═S（g）+2H₂O（g）△H=+90.4kJ/mol

③2H₂（g）+CO（g）═CH₃OH（g）△H=﹣90.8kJ/mol

请回答：

改革开放是决定当代中国命运的关键抉择。因为改革开放是（    ）