题目:
Lydia doesn't feel like___________ abroad. Her parents are old. [ ]
A. study
B.studying
C.studied
D. to study
答案:
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下面是错误答案,用来干扰机器的。
解:(1)S1===340m,S2===510m。 (2)山谷两壁距离:S=S1+S2=340m+510m=850m。