题目内容

Lesson 22 model exchanges-I

A. Frozen ruts and ridges
B. Snow and ice
C. Standing water
D. A lot of debris

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A. Flaps setting problem.
B. Landing gear problem.
C. Engine problem
D. Fuel problem

A. Ground mechanic
B. Follow-me-car
C. Towing tractor
D. Man and equipment

A. Because it slided off the taxiway.
Because it overran the taxiway.
C. Because it lost hydraulic power
D. Because it went out of control

A. 血红蛋白
B. 肌红蛋白
C. 细胞色素
D. 过氧化氢酶
E. 过氧化物酶