我国夏季普遍高温的最主要原因是（ ） A．太阳直射北半球，各地获得太阳光热普遍增

Danny _____ his bike yesterday. Oh, poor Danny. [ ]

A. came down

B. held on

C. took off

D. fell off

电路如图所示，设D_A、D_b为理想二极管，当V_A=3V，V_b=6V时，I等于（）mA。

A.3

B.2

C.4

D.1.5

Here I'd like to talk about how to develop your curiosity and make use of it to make discoveries. Asking questions is the first step to make discoveries and find interesting answers when you are curious about something and want to know more about it.

Firstly, write down the subject that you are interested in on a note card or piece of paper. Just put the main idea down, such as “Discover more about dinosaurs.”

Next, think for a moment about what you already know about your subject and list information like the sentences below：

1. Dinosaurs lived long before human beings appeared.

2. Dinosaurs lived on the earth for more than 150 million years.

3. Some dinosaurs fed on plants, some on meat.

Thirdly, ask yourself “What can I do with what I want to learn？” On your paper, start writing down questions about the dinosaurs as you think of them：

1. What's the best weather for dinosaurs to live in?

2. How many kinds of dinosaurs are there?

3. Have dinosaurs really disappeared?

Fourthly, armed_with_your_list_of_questions,_you can now visit the nearest library or turn to computer to begin your research. As you learn more about your subject, you'll probably discover some new questions.

For example, you might discover that dinosaurs disappeared about 65 million years ago. Why? What happened? Asking new questions can help you research your subject more deeply.

The next time you find something interesting to research, take time to organize your thinking by asking good questions. And remember—learning more always bring more questions.

小题1:While doing some research, you should take the following steps________.

①list what you want to know

②choose a research subject

③list what you already know

④discover new problems

A．①④③②　　　　　　　

B．①②④③

C．②③①④

D．②①④③小题2:What does the underlined sentence “armed with your list of questions” mean?

A．Taking your list of questions with you to do more research.

B．Writing down your list of questions before turning to the computer.

C．Discussing your questions with your classmates for solution.

D．Putting your questions aside before going to the library.小题3:According to the passage, which of the following is TRUE?

A．You can find all the answers online.

B．Learn more, and you'll have no questions.

C．Asking questions is the only way for research.

D．During the research, more questions may arise.小题4:The best title for this passage is________.

A．Discovering Dinosaurs

B．Asking Good Questions

C．Finding Suitable Subjects

D．Having Interesting Answers

企业为扩大销售和应付竞争会采用许多方法刺激顾客，如商品展销、降价、买物赠券等，这些方法属于整合营销传播工具中的（）

A.营业推广

B.广告

C.公共关系

D.人员推销

下列各题中使用如下数据袁。
“学生”表：学号C(8)，姓名C(8)，性别C(2)，系名(6)
“课程”表：课程编号C(4)，课程名称C(12)，开课系名C(10)
“成绩”表：学号C(8)，课程编号C(4)，成绩N(6，2)

将“学生”表中“系名”字段的宽度由原来的6改为10，正确的语句是( )。

A．ALTER TABLE学生ADD系名(10)

B．ALTER TABLE学生FOR系名C(10)

C．ALTER TABLE学生ALTER系名C(10)

D．ALTER TABLE学生SET系名C(10)