You should be careful the dog that doesn't bark.[ ]
A. of
B. for
C. on
答案：A
Don't worry. Kate can look after your pet cat _______.[ ]
A. careful enough
B. carefully enough
C. enough careful
D. enough carefully
酸性土指示树种是（）。
A.怪柳
B.乌桕
C.海桐
D.杜鹃
