Tom said he ____ at that time. [ ]
A. is cooking
B. cooked
C. was cooking
D. cooks
答案:C
釉质无机盐占总量的()
A.99%
B.80%
C.96%~97%
D.95%
E.90%
叶圣陶1928年发表的长篇小说()是他自己唯一的长篇小说。