Unit 4 Section Ⅲ
Ⅰ.单词拼写
1．She has a degree in __biology__(生物学)．
2．An apple falls down because of __gravity__(重力)．
3．The moon is a __satellite__(卫星)of the earth.
4．He is a lovely boy，very __gentle__(温和的)and caring.
5．He is a __physicist__(物理学家)of the first rank.
6．Some plants will not grow in a cold __climate__(气候)．
7．The plane __crashed__(坠落)mysteriously near the island.
