在电子显微镜下,单位膜所呈现出的结构是()
A.一层深色带
B.一层浅色带
C.一层深色带和一层浅色带
D.二层深色带中间夹一层浅色带
E.二层浅色带中间夹一层深色带
参考答案:D
If you’re a poor driver, you should not_______ at night.
A.to try driving
B.try to drive
C.to try to drive
D.try driving
胸上肢肌由胸大肌、胸小肌和()构成。
A.前锯肌
B.斜方肌
C.肋间外肌
D.三角肌