问答题

Punctuation （1） is used to signal the start and end of the code block.

答案： {};{ };

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单项选择题

Although this helps to lower costs, the materials are often of poor quality. This has resulted in ________________ orders.

A．A placed
B．B placing
C．C cancelled
D．D canceling

单项选择题

分化的中胚层可以划分为 5个大的区域，分别为脊索中胚层、近轴中胚层、间中胚层、侧中胚层和头部间充质。

A.正确
B.错误