Are you having trouble in science? If so, read the following tips to learn how to do well in science?
小题1:___________ Science can be useful and interesting. It’s important to be confident in order to do well in science. You should enter your lab with the thought that you might learn something useful or interesting.
小题2:___________ If you know you’re going to learn something important, then carefully read it before class. It will give you some understanding of the subject before you begin studying it.
小题3:___________ Listen to what the teacher is saying and nod once in a while to show that you’re listening. Make sure you always raise your hand and it shows that you pay attention and take this seriously.
小题4:___________ After class, you can read the textbook and write what you can remember. Then look for differences between the textbook and what you wrote. If you don’t understand something, just ask the teacher, and they will help.
从A、B、C、D中选择正确的选项作为文章第2-5段的小标题， 并填入四个空格中。
A. Pay attention in classes B. Go over after class
C. Read before class D. Be confident
小题5:Which is the best title for the passage?
A．How to be a science teacher
B．How to be a scientist
C．How to do well in science
D．How to pay more attention in class
，则FB=___________；当绳B端固定不动，腿在A端用力FA拉绳，仍使该重物匀速上升，则 FA=________（不考虑绳重和摩擦）。 
