重力的方向是垂直向下的． （______）
重力的方向是竖直向下的，不是垂直向下的，说法错误．
故答案为：×．
中国近海流系有哪些？
— _____ people are taking action to protect the environment now.
— Yes. _____ of my classmates come to school by bike now. [ ]
A. More and more, Four fifth
B. Less and less, Four fifth
C. More and more, Four fifths
D. Less and less, Four fifths
