根据以下内容，回答下列各题。

Researchers have found that REM (rapid eye movement) sleep is important to human beings．This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence．The deeper a person’s sleep becomes, the longer the periods of rapid eye movement．

There are physical charges in the body to show that a person has changed from NREM (non-rapid eye movement) to REM sleep．Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly．

For this part, you are allowed 20 minutes to write a short composition of about 80 words on the title: The Bicycle in China．Base your composition on the outline given below．

1．在中国，自行车是最为流行的交通工具。

2．骑自行车有许多好处。

3．自行车的未来……

请在第_____处填上正确答案。

请在第_____处填上正确答案。

请在第_____处填上正确答案。

请在第_____处填上正确答案。

根据以下资料，回答下列各题。

Eloise: What are you doing this weekend?

请在第_____处填上正确答案。

According to the selection more than half of a person’s body is composed of ______．

• A.voluntary muscles
• B.involuntary muscles
• C.muscle fibers
• D.sensory nerves

Muscles are unique fibers because, they can ________．

• A.contract
• B.stretch
• C.retract
• D.do all of the above

Under a microscope, muscle cells appear to be _______．

• A.textured like wood
• B.colored like wood
• C.smooth and red
• D.short and thick

根据以下内容，回答下列各题。

• Are you aware that you actually possess six senses? The sixth is a muscular sense responsible for directing your muscles intelligently to the exact extent necessary for each action you perform．For example, when you reach for an object, the sensory nerv
• According to the selection, the muscular sense is responsible for ______．
• A.the efficiency of our muscles
• B.the normal breathing function
• C.directing our muscles intelligently
• D.the work of only our involuntary muscles