我为玉树灾区捐献了9本书，比弟弟多捐了2本，弟弟捐了多少本？

已知射线l₁：y=4x（x≥0）和点P（6，4），试在l₁上求一点Q使得PQ所在直线l和l₁以及直线y=0在第一象限围成的面积达到最小值，并写出此时直线l的方程．

阅读理解。

     We've talked about snails (蜗牛) and their slow move. But much of the time snails don't move at all.

They are in their shells (壳) -sleeping.

      Hot sun will dry out a snail's body. So at the least sign of hot sun, a snail draws its body into his shell.

A snail will die in a heavy rain. So when it rains, a snail does the same thing, too. A snail can sleep for as

long as it needs to. It spends all the winter months in its shell, asleep.

      In the spring the snail wakes up. Its body, about three inches long, comes out from the shell. When

hungry, the snail looks for food. Its eyes, at the end of the top feelers (触角), are very weak. But its sense

(感觉) of smell is very strong. It helps the snail to find food and the new greens.

      A snail's mouth is no bigger than the point of a pin (大头针). Yet it has 256,000 teeth! The teeth are

very small, and you can't see them. If you put a snail in a hard paper box, it will eat its way out! And if a

snail wears out its teeth, it will grow new ones.

1. A snail _________. 　

A. moves more slowly at night　　

B. has thousands of feet

C. doesn't move at all 　　

D. sleeps much of the time

2. In the sentence "A snail draws its body into its shell", the word "draw" means _________. 

A. to make with a pencil

B. to push　　

C. to pull

D. to move away

3. From the story, we know _________. 　

A. a snail's shell is very thin

B. a snail can't see well 　

C. a snail's nose is quite short

D. a snail's body changes in different seasons

4. A snail goes to sleep when _________. 　

A. it feels hungry

B. it is put into a paper box

C. spring is coming

D. it rains heavily

5. Which of the following is wrong?

A. In winter the snail doesn't eat or move.　　

B. A snail doesn't like living under the sun.

C. The snail's teeth can't be worn out.

D. The snail's nose helps to find food.

有关缩宫素的药理作用下列哪项是正确的 （）

A.小剂量引起妊娠末期子宫体节律性收缩

B.大剂量不引起子宫强直性收缩

C.大剂量对妊娠各期子宫均有兴奋作用

D.孕激素可增高子宫对缩宫素的敏感性

E.雌激素可降低子宫对缩宫素的敏感性

图中实线和虚线分别是x轴上传播的一列简谐横波在t=0和t=0.03s时刻的波形图，已知x=1.2m处的质点在t=0.03s时刻向y轴正方向运动，则

A．各质点在0.03s内随波迁移0.9m

B．该波的频率可能是125HZ

C．该波的波速可能是10m/s

D．t=0时x=1.4m处质点的加速度方向沿y轴正方向

— What was she doing when you came in?

— She was________the view from the window. [ ]

A. respecting  

B. admiring

C. gathering  

D. hunting