按要求改写句子。 1．羊已经丢了，还修羊圈干什么呢？（给句子换个说法，使句意不变）

月球上有丰富的核聚变燃料“He--3”．“He--3”是原子核内含有2个质子和1个中子的氦原子．则氦原子的电子数是（　　）

A．1

B．2

C．3

D．4

根据你个人的看法回答下列问题。

1. What do you think of "Animal World"? 

    ___________________________________________________

2. What does your mother think of "Chinese Cooking"? 

   ___________________________________________________

3. What does your father think of "Man and Nature"?

   ___________________________________________________

4. What do you think of "Sports World"?

   ___________________________________________________

5. What TV show (programme) do you like best? Why? 

   ___________________________________________________

可分泌IL-2和IFN-7的细胞是

A．Th1细胞
B．B细胞
C．NK细胞
D．CTL
E．Th2细胞

Currently 94% of Web users use either Internet Explorer or Firefox, but recently some new (31) have been developed that are beginning to attract attention. The browser Opera is becoming very (32) because of its speed, it is currently the world’s fastest browser, and because it is much smaller (33) existing browsers (it can almost fit on a single diskette). It can also (34) the last Web page you visited, so the next time you surf, you can start where you left off. And like the big two, you can get it for free; the catch is that you have to watch blinking ads in one comer, or pay ＄40 for the ad-free (35) of Opera.

32（）

A.popular 

B.notorious 

C.wonderful 

D.common

忘忧散功效与作用