这道题其实在很多类型的考试中出现过,形式是单项选择题。参考答案请看图片:
答:1.A. through
B. for
C. on
D. against
2.A. sound
B. light
C. heat
D. tide
3.A.in
B. at
C. over
D. on
4.A.sends
out
B.works out
C. figures out
D. puts out
5.A.
producing
B. produced
C. produce
D. produces
你写错了。是ab=cd ae=de a角等于角d。用sas求。至于ab=cd你还要加一个过程证明