如图分别为细胞结构和显微镜结构示意图,请据图回答:
认识大洲综合分析。读欧亚两大洲示意图,回答问题。
⑴____ A. red B. then C. ticket D. spend
⑵____ A. maths B. thank C. think D. there
⑶____ A. weather B. bread C. tea D. breakfast
⑷____ A. toy B. boy C. goat D.coin
⑸____ A. find B. film C. five D. climb
已知tanβ=sin39°19′+cos80°10′,则锐角β≈____(结果精确到1′).