Under a microscope, muscle cells appear to be _______．

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