12. we all agree that ____good knowledge of physics is a must in explaining such ____natural phenomena.
a. a; 不填 b. a; a c. 不填;a d. 不填;不填
13. after that, he knew he could ____any emergency by doing what he could to the best of his ability.
a. get away with b. get on with c. get through d. get across
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