某校向学生发出了一份倡议书，其主题是“中小学生应见义智为”。这份倡议书在肯定见义

根据短文内容和首字母提示，补全文中单词。

    All (1)a              the world, people drink tea. But tea doesn't mean the same thing to everyone. In

different countries people have very (2)d              ideas about drinking tea.

    In China, for example, tea is always served (3)w              people get together. The Chinese drink it

at any time of the day at (4)h              or in tea houses. They prefer their tea plain, with nothing

(5)e              in it.

    Tea is (6)a              important in Japan. The Japanese have a special way of serving tea (7)c             

 a tea ceremony (茶道). It is very old and full of meanings. Everything must be done in a special way in

the ceremony. There is even a special room for it in (8)J             homes.

    (9)A              tea-drinking country is England. In England, the late afternoon is "teatime". Almost

everyone has a cup of tea then. The English usually make tea in a teapot and drink it (10)w             cream

and sugar. They also eat cakes, cookies and little sandwiches at teatime.

夏季某日，某地区距地面一定高度的空中有两块相距3km的足够大的云团，由于受湿气流影响，两块云团正在以5m/s的相对速度靠近，不断与空气摩擦带电。设两云团之间电势差保持3×10⁹V不变，已知空气电离的电场强度（即发生放电时的电场强度）为3×10⁶V/m，两云团间的电场可视为匀强电场，则大约经过________秒，将会发生放电现象；在这次放电中，若从一块云团移到另一块云团的电荷量为500C，闪电历时0.01s，则此过程中的平均电流为________安培．（提示：电流I＝）

痤疮时下列腺体分泌增加的是（）。

A.唾液腺

B.汗腺

C.皮脂腺

D.肾上腺

E.甲状腺

下列陈述中正确的是 ______。

A．二叉树是度为2的有序树

B．二叉树中结点只有一个孩子时无左右之分

C．二叉树中必有度为2的结点

D．二叉树中最多只有两棵子树，并且有左右之分

桥梁检查分为（）。

A、日常巡查

B、经常检查

C、定期检查

D、一般检查

E、特殊检查