【单选题】听力原文:W: Good morning, class. Today I thought we would talk about something bright and cheerful—the sun. Can anyone tell me how you feel when it's sunny compared to how you feel when it's cloudy? M: I ...
A.
Lack of vitamins is the main cause of skin cancer.
B.
New research proves that sunbathing causes no problems at all.
C.
The danger of the sunshine has been ignored because of its benefits.
D.
Proper exposure to the sun can contribute a lot to our health.
【简答题】When you are going to talk about something that you have already decided, you should use _____. When you are going to talk about something you just just decide when having a conversation, you should u...