甲基绿派洛宁染色法显示DNA和RNA染液最佳pH值应是（） A.pH7.0 B.pH

阅读理解。

     The Internet has become not only a necessary but also a virtual (虚拟的) world for people. With the

development of the Internet, internet friendship has also become very popular. Online friends are those people

who have known each other through the Internet. Making internet friends is the same as making pen friends.

Many famous websites offer quite warm internet friendship. One can find many people on these websites and

they share the same interests. It is difficult to make friends with someone you can't see or feel. That is the

main problem of internet friendship. A virtual friendship would not last forever without seeing each other, but

it is an advantage for some people because they are afraid to speak in pubic.

     On the other hand, the chances of cheating (欺骗) are very high in an internet friendship. Some people

make friends on the Internet with wrong intentions (企图).So while making friends over the Internet, one has

to be very careful. Here are some suggestions for you. ·Don't give personal information, such as your

telephone number, address, location, school name as well as your parents' information, to strangers on the

Internet. 

      ●Do not exchange personal photos of you or any family member with people you meet over the Internet.

      ●Do not go to meet a person you have just met over the Internet. You'd better ask older or other 

experienced people for advice if you want to go to meet an internet friend.

      ●Do not accept someone's request (要求) if you feel he or she is dishonest.

1. Is the Internet necessary and virtual for people?

   ______________________________________________________________________

2. What is the main problem of internet friendship? 

   ______________________________________________________________________ 

3. Why is the virtual friendship an advantage for some people?

   ______________________________________________________________________

4. Who can you ask for advice if you go to meet an internet friend?

   ______________________________________________________________________ 

5. What does the article give suggestions about?

   ______________________________________________________________________

如下图所示，某泵房按二级桩基考虑，为抗浮设置抗拔桩，上拔力设计值为600kN，桩型采用钻孔灌注桩，桩径d=550mm，桩长ι=16m，桩群边缘尺寸为20m×10m，桩数为50根，按《建筑桩基技术规范》（JGJ941994）计算群桩基础及基桩的抗拔承载力，下列（）与结果最接近（桩侧阻抗力分项系数γs=1.65；抗拔系数λi，对黏性土取0.7，对砂土取0.6，桩身材料重度γ=25kN/m3；群桩基础平均重度γ=20kN/m3）。（）

A.群桩和基桩都满足要求

B.群桩满足要求，基桩不满足要求

C.群桩不满足要求，基桩满足要求

D.群桩和基桩都不满足要求

记名提单、不记名提单、指示提单都是物权凭证，因此都可以流通转让，它们的区别在于转让的方式不同。 ( )

甲和乙因共同抢劫被A区公安机关立案侦查。A区公安机关决定对二人采取监视居住强制措施，甲在住处执行，乙因无固定住处而在指定的居所执行。对此，下列说法正确的是（）。

A.A区公安机关决定乙在指定的居所执行的，要经上一级公安机关批准

B.除无法通知的以外，应当在执行监视居住后24小时以内，通知二人的家属

C.二人委托辩护人，都适用在押的犯罪嫌疑人委托辩护人的规定

D.只有乙监视居住的期限应当折抵刑期

辍学打工虽然可以赚到第一桶金，但缺少了读书求学的（）和校园生活的（）你的青春风景会大打折扣，人生又会回到老路。