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【单选题】
数据链路层的数据单位是A.
比特
B.
帧
C.
数据包
D.
数据报
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【单选题】听力原文： A country's latitude, or distance from the equator, has an important effect on its climate. In places located at low latitudes, or near the equator, like Ecuador and northern Brazil, the amount ...
A.
At low latitudes.
B.
At mid-latitudes.
C.
At high latitudes.
D.
At high altitudes.
【单选题】6
A.
It was the biggest earthquake that happened in Ecuador
B.
It was the worst natural disaster in Ecuador since 1949
C.
It has brought about the biggest challenge in Ecuador
D.
It has sounded an alarm to environmental protection
【单选题】听力原文： A country's latitude, or distance from the equator, has an important effect on its climate. In places located at low latitudes, or near the equator, like Ecuador and northern Brazil, the amount ...
A.
At low latitudes.
B.
At mid-latitudes.
C.
At high latitudes.
D.
At any latitude.
【简答题】开展学前儿童体育活动时,应遵循的规律是________、 ________、________?
【单选题】听力原文： A Boeing 727 aircraft with 51 passengers and 10 crew on board has crashed into a mountain side just outside the Columbia capital, Bogota. Police and rescue workers said everyone was killed when ...
A.
61
B.
51
C.
41
D.
10
【单选题】Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you ...
A.
It's a country surrounded by the Pacific Ocean.
B.
It's a long country with 1 285 000 kilometers.
C.
It's a country with a lot of mountains.
D.
It's a country full of natural resources.
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