In order to()your goals, you must work hard.
A.make
B.achieve
C.require
D.develop
参考答案:B
Lucy, eat this ___________. You are too fat. You need (需要) to eat vegetables every day.[ ]
A. banana
B. carrot
C. milk
对维持与调节机体酸碱平衡起重要作用的脏器有().
A.肺
B.胃肠道
C.肝
D.肾
E.脑