解方程：（1）3x-6（x+1）=5（2）x+13-x-26=2-x2．

近年来，在预防传染病的疫苗家族中增加的第三代疫苗-DNA疫苗，是由病原微生物中的一段表达抗原的基因制成的，这段基因编码的产物仅仅能引起机体的免疫反应。以下关于DNA疫苗的叙述不正确的是[ ]

A．DNA疫苗导入人体后能够产生特异性免疫

B．导入人体的DNA疫苗在体内直接产生抗体，起到免疫作用

C．DNA疫苗的接种可以达到预防特定微生物感染的目的

D．DNA疫苗接种后引起人体产生的抗体是由浆细胞合成的

与肠道黏膜屏障功能有关的氨基酸是（）

A.芳香族氨基酸

B.同型半胱氨酸

C.精氨酸

D.丝氨酸

E.谷氨酰胺

—Is this ________ ruler?

—Yes, it's her ruler.[ ]

A. your     

B. your sister's  

C. your brother's

句型转换。（5小题，每空0.5分，共5分）

根据要求，改写句子，每空一词。

小题1:How about buying Mom a coat?  (改为同义句)

__________ __________ buy Mom a coat?

小题2: We want to have a picnic on the West Hill.  (对划线部分提问)

__________ do you want to __________ a picnic?  

小题3: She has dinner with her friend.  (改为否定句)

She __________ __________ dinner with her friend.  

小题4:They have five toy cars.  (改为一般疑问句)

________ they ________ five toy cars?

小题5:Lucy has breakfast at seven o’clock in the morning.  (对划线部分提问)

______ ______ does Lucy have breakfast in the morning?

用所给单词的适当形式填空。

1. Simon said he had a _______( please) journey last week.

2. Every year many _______( tour)  come to Beijing to visit the Great Wall.

3. We should work hard at English because it's important in our_______( day) life.

4. It is_______ (possible) for him to finish the work in one hour, because it's very difficult.

5. Don't worry! They can take care of_______( they).