题目内容

/******************************************************************************** Function Name : RCC_Configuration* Description: Configures System Clocks*******************************************************************************/void RCC_Configuration(void){RCC_DeInit();RCC_HSEConfig(RCC_HSE_ON);HSEStartUpStatus = RCC_WaitForHSEStartUp();if(HSEStartUpStatus == SUCCESS){RCC_HCLKConfig(RCC_SYSCLK_Div1);RCC_PCLK2Config(RCC_HCLK_Div1);RCC_PCLK1Config(RCC_HCLK_Div2);FLASH_SetLatency(FLASH_Latency_2);FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);RCC_PLLCmd(ENABLE);while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);while(RCC_GetSYSCLKSource() != 0x08);}/* Enable GPIOA~E and AFIO clocks */（1）}/******************************************************************************** Function Name : GPIO_Configuration* Description: Configures GPIO Modes*******************************************************************************/void GPIO_Configuration(){/* Configures IO*/GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStructure);//开关按钮 A0 C13（2）（3）}

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B Listen to the dialogue again, and then choose the best answer.[音频]1. The man and the woman are talking about_______.

A. their trip to Suzhou
B. their trip toTibet
C. their travel plan for next year

2. Why do they want to cancel the trip?

A. Because they don’t have enough time.
Because they don’t have enough money.
C. Both A and B.

3. According to David, how can they get enough money for the trip?

A. By asking their parents for money.
By working during the vacation.
C. By saving money.

4. At last, what have they decided to do this May Day holiday?

A. Go toTibet.
B. Stay at home and make some money.
C. Go to some nearby places.