try-catch-finally语句中（）释放资源？

A:try B:catch C:finally D:throw

If he (gives) a chance to (enroll) in your university, I'm sure he (will prove) his (worth).

A:gives B:enroll C:will prove D:worth

There is no point ______ to persuade him to have one more try.

A:to try B:of trying C:in trying D:if you try

What does the author try to prove in this passage

A:A telephone is essential. B:What many people think necessary is not necessary at all. C:You would not use a telephone unless you were in a hurry. D:A car is essential for a taxi-driver.

If he (gives) a chance to (enroll) in your university, I'm sure he (will prove) his (worth).

A:gives B:enroll C:will prove D:worth

设有结构体类型定义：
struct try
int one;
float two;
*str;
若要动态开辟一个结构单元，使指针str指向其首地址，正确的语句是______。

A:str=(try*)malloc(sizeof(try)); B:*str=(struct try*)malloc(sizeof(struct try)); C:str=(strucy try*)malloc(sizeof(struct try)); D:str=(struc try)malloc(sizeof(struct try));

设有结构体类型定义：
struct try
int one;
float two;
*str;
若要动态开辟一个结构单元，使指针str指向其首地址，正确的语句是______。

A:str=(try*)malloc(sizeof(try)); B:*str=(struct try*)malloc(sizeof(struct try)); C:str=(strucy try*)malloc(sizeof(struct try)); D:str=(struc try)malloc(sizeof(struct try));