我们常说“旭日东升”、“夕阳西下”，对太阳这种东升西落的现象，我们所选择的参照物是（　　）

兴趣小组同学用氧化铜与足量的炭粉利用图甲所示的装置进行实验，对生成气体的成分进行探究。

【提出问题】生成的气体中是否含有一氧化碳?

It's important to teach children to create strong passwords（密码），and to remind them that passwords mustn't be shared with anyone, not even best friends.

A strong password is a word that is as difficult as possible to guess because it looks like a set of random characters （随机的字符）.

It's wise to use the whole keyboard to mix a password with letters, numbers and symbols. A password of 14 characters or more may be much safer.

The following tips will tell you how to create a strong and safe password:

Tip 1: Think of a sentence that is easy to remember, but difficult to guess. For example: “ My son Peter is five years old and my daughter Tina is one year old.”The whole sentence is so long that it can't be a password, so what you can do is to use the first letter of each word to make a new password that seems to be meaningless. That is “mspifyoamdtioyo”.

Tip 2: Make the password more difficult to guess by mixing big and small letters. One way to do this is to use big and small letters one after another. In this way this new password will be “MsPiFyOaMdTiOyO”.

Tip 3: Still using the sentence above, you can also add numers that are meaningful to you. As a result, the new password will be “Mspi5yOaMdTi1yO”.

Tip 4: Add punctuation（标点符号）and symbols to make the password much stronger. You may use symbols, numbers and punctuation to replace some letters which look similar. For example: “MsPi3y0@MdTi!y0”.(o=0, a=@, 1=!)

任务型阅读。根据材料内容，按要求完成下列各题。

白居易《钱塘湖春行》描写所见早春景象的句子是：____，____。