婴儿主要依靠（）上的变化产生对时间的条件反射。
参考答案：生理
—What will Lucy do this Sunday?
—She as well as her family ______ go camping by a small lake.
A. am going to B. is going to C. are going to
未冻结的海水盐度一般为（）。
A.10~15
B.15~25
C.20~35
D.25~30
