There _____________ a pen and two pencils in the box. [ ]
A. are
B. is
C. has
D. have
答案:B
二叉树(BinaryTree)
类风湿性关节炎的护理措施重要的是
A.休息
B.关节疼痛减轻后及时进行活动
C.限制活动
D.抬高头部
E.抬高膝部