设D由曲线xy=2，y=x+1，y=x-1围成，求二重积分

通常，将软件产品从提出、实现、使用维护到停止使用退役的过程称为______

下列关于直肠癌的淋巴转移的叙述，错误的是（）

A.向上转移

B.向两侧转移

C.向下转移

D.向腹股沟淋巴结转移

E.逆行性转移

用所给单词的适当形式填空。

l. Mr Brown _____ (go) to his office by bike every day.

2. Why not _____ (go) to the zoo by bus?

3. It ____ (take) about 15 minutes to walk.

4. There _____ (be) many deer in the forest now.

5. There must _____ (be) many sheep.

6. Kate is walking to her home ____ (quick).

脑膜炎患者脑脊液标本离心后取沉渣涂片镜检用墨汁染色，镜下可见直径4～12微米圆形菌体，外周有一透明肥厚荚膜。

据上述考虑患者由下列何种微生物引起脑膜炎（）。

A.新型隐球菌

B.白色念珠菌

C.肺炎球菌

D.脑膜炎球菌

E.曲霉菌

---To grow thinner, you must eat food with plenty of fiber and stop drinking cola or eating sweet food.

---Does it mean I can’t eat my favorite fried chicken any more?

--- ________, if you love fried chicken, you needn’t give it up.

A．Not possible

B．No problem

C．Not exactly

D．Not at all