灭火的基本原理可以归纳为:冷却法、窒息法、隔离法和化学抑制法。()
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Choose the best answer to complete each sentence.1. I want to help him, ________ I'm not sure I know how.
A. because
B. but
C. so
Choose the best answer to complete each sentence.The picnic this weekend has been cancelled _________ bad weather.
A. due to
B. but
C. because
Choose the best answer to complete each sentence.He's still smiling________ he is in a lot of pain.
A. however
B. even though
C. because
Choose the best answer to complete each sentence.I'm not good at cooking. ________, I don't mind doing other types of housework.
A. However
B. Since
C. Because