choices.label: A B C D
choices.text: sun:temperature exercise:health bad news:sorrow computer:radiation
explanation: "pollution" may be because of "pesticides". the change in "temperature" is caused by the difference in the oblique angle of the "sun", and the "temperature" is not because of the "sun". "healthy" may be because of "exercise". "sorrow" must be because of hearing "bad news". all objects in nature, as long as the temperature is above the absolute temperature of zero, will constantly transmit heat in the form of electromagnetic waves and particles. this way of transmitting energy is called "radiation", "computer" has "radiation", "radiation" is not because of "computers".
relation: pollution pesticides R5.1
relation: temperature sun R3.10
relation: health exercise R5.1
relation: sorrow bad news R5.1
relation: computer radiation R3.1