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Lesson 7 短听力选择 2听一遍，选择正确答案

An aircraft mistakenly blocked his way.
B. ChinaSouthern1347 taxied to a wrong way.
C. Boeing747 encountered gear problem.
D. An unreported vehicle was on the Taxiway B

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Lesson 7 短听力选择 3听一遍，选择正确答案

A. No.2 engine was overheating.
B. The temperature of brakes was over limitation.
C. Fire warning light illuminated.
D. They had a flat tyre on the nose gear.

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Lesson 7 短听力选择 4听一遍，选择正确答案

A. Security services
B. De-icing truck
C. Tug and passenger stairs
Doctor and ambulance.

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Lesson 7 短听力选择 5听一遍，选择正确答案

A. Taxi via H and G.
B. Follow an airbus 320 via G and H.
C. Taxi straight ahead.
D. Taxi via taxiway G and T.

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下列哪项不符合初次应答中抗体的特点：

A. 诱导期长
B. 抗体效价低
C. 维持时间短
D. 抗体类型主要为IgG

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Lesson 7 短听力选择 2听一遍，选择正确答案

An aircraft mistakenly blocked his way. B. ChinaSouthern1347 taxied to a wrong way. C. Boeing747 encountered gear problem. D. An unreported vehicle was on the Taxiway B

Lesson 7 短听力选择 3听一遍，选择正确答案

Lesson 7 短听力选择 4听一遍，选择正确答案

Lesson 7 短听力选择 5听一遍，选择正确答案

下列哪项不符合初次应答中抗体的特点：

An aircraft mistakenly blocked his way.
B. ChinaSouthern1347 taxied to a wrong way.
C. Boeing747 encountered gear problem.
D. An unreported vehicle was on the Taxiway B