音标题（每个0.5分，共10分） 1、默写出7个短元音 _______ ____

中国封建社会开始于[ ]

A．春秋时期

B．战国时期

C．秦朝

D．夏朝

关于TD抗原和TI抗原引起的免疫耐受，以下说法错误的是（）

A.TI抗原高剂量才能诱导B细胞耐受

B.TD抗原低剂量与高剂量均可诱导耐受

C.TD抗原低剂量仅能诱导T细胞耐受

D.TI抗原低剂量也能诱导T细胞耐受

E.TI抗原低剂量不能诱导T细胞耐受

根据句意，用所给动词的适当形式填空。

小题1:More than one person                  (clean) the classroom at 6 o’clock yesterday.

小题2:The boy has been used to                 (lie) when he makes a mistake.

小题3:It’s said the price of food in China                   (rise) quickly recently.

小题4:I tried many ways I could think of                    (stop) the little boy from crying.

小题5:Not only the students but also the teacher                  (ask)to go to school on time now.

Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,________ two boys, aged 11 and 13, shot and killed a teacher and four girls.

A．while

B．where

C．when

D．then

合同附件是正文描述义务的补充，合同正文越复杂，合同附件也越复杂。