简述一种真菌的分子生物学鉴定方法的基本原理。

求代数式5x²﹣4xy+y²+6x+25的最小值．

下列关于盈利预测的披露说法中，错误的是（）。

A.发行人披露盈利预测报告的，应声明："本公司盈利预测报告是管理层在最佳估计假设的基础上编制的，但所依据的各种假设具有不确定性，投资者进行投资决策时应谨慎使用。"

B.发行人披露的盈利预测报告应包括盈利预测表及其说明

C.盈利预测表的格式应与资产负债表一致

D.需要编制合并财务报表的发行人，只需编制合并盈利预测表

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Having friends may well keep you healthier and help you deal with stress better. Some studies show that people with close friends have a greater ability to fight disease than people who are alone.

Make friendship a priority(优先). Find the time to be with friends even if it means letting the lawn go unmowed(未割草) or the dishes unwashed for a while. When you can’ t get together, use the phone to keep in touch.

Open up to close friends. Maintaining a deep friendship requires a level of heartfelt intimacy(亲密). Don’t be afraid to express your inner fears and disappointments. Listen to your friends when they have problem, but offer advice only when it’s wanted. Help raise friends’ self-esteem when they are shaken by a job loss, or other such events.

Have different friends for different activities, such as going to the movies, singing in a choir(合唱), and joining in a bowling league.

Don’t wait for a friend to ask a favor. When a friend has the flu, offer to go to the store or drive his or her children to their after-school activities.

Never take a friendship for granted. Like a good marriage, friendship needs care and patience. Become a joiner. Find a group that matches your interests.

Talk to strangers. Conversations started in museums, laundry rooms, or bookstores can lead to firm friendship.

Enroll in an adult-education course. A classroom is an ideal place to meet others with similar interests.

60. People with close friends have a ____ ability to fight disease than people who are alone.

A. less            B. greater           C. poorer            D. little

61. What we should do to have friends according to the author?

A. Make friendship a priority.          B. Open up to close friends.

C. Never take a friendship for granted    D. All the above.

62. Which of the statements is TRUE according to the passage?

A. You should have different friends for the same activities.

B. You should wait for a friend to ask a favor.

C. You should avoid talking with stranger in museums, laundry rooms of bookstores.

D. You should never take a friendship for granted.

63. . The underlined word “ enroll” in the last paragraph means _____.

A. give       B. join     C. get     D. catch

简述狭义的创新概念？

• A．条件(1)充分，但条件(2)不充分．
• B．条件(2)充分，但条件(1)不充分．
• C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
• D．条件(1)充分，条件(2)也充分．
• E．条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

3x²-4ax+a²＜0的解集为

．
(1)a＞0； (2)a＜0．