单选题：The article says that

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题目内容：

The article says that A．the weather is the biggest problem farmers have.
B．the weather affects agricultural crops.
C．farmers can't work if there is too much rain.

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The machines are maintained regularly __________ they don't

The machines are maintained regularly __________ they don't break down.

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Reading: Look at the questions. In each question, which sent

Reading: Look at the questions. In each question, which sentence is correct?A．Th

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On the whole, travelling by train for that distance is _____

On the whole, travelling by train for that distance is __________ than flying.

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母乳喂养儿粪便中主要的细菌是

母乳喂养儿粪便中主要的细菌是A．大肠杆菌 B．肠链球菌 C．副大肠杆菌 D．变形杆菌 E．乳酸杆菌

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IP地址块211．64．0．0／11的子网掩码可写为（　　）。

IP地址块211．64．0．0／11的子网掩码可写为（　　）。 A．255．192．0．0 B．255．224．0．0 C．255．240．0．0 D．255．

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