Every year I go to the beach in Sanya with my family. My favorite beach is called Xixiu Beach. It has soft sand and palm trees. I make sandcastles and watch sailboats. Sometimes we see dolphins!

1.1. Where is Xixiu Beach?

A In Beijing.

B In Sanya.

C In Shanghai.

D In Guangzhou.

解析：选B。B 细节理解题。文章开头第一句就交代了“Every year I go to the beach in Sanya with my family.”，紧接着又说“My favorite beach is called Xixiu Beach.”，由此可知，Xixiu Beach 是作者一家在 Sanya 常去的海滩，因此它位于 Sanya。北京、上海和广州在文中完全没有出现，与文章信息毫无关联，所以不能选。故选B。

2.2. What does the writer do at the beach?

A Make sandcastles.

B Play volleyball.

C Ride a sailboat.

D Catch dolphins.

解析：选A。A 细节理解题。文中明确写道“I make sandcastles and watch sailboats.”，make sandcastles 是作者在海滩上实实在在会做的事情，因此 A 项正确。B 项“play volleyball”全文没有提及，属于无中生有。C 项“ride a sailboat”是干扰项，文中说的是 watch sailboats（看帆船），而不是亲自去驾驶帆船，两者动作完全不同。D 项“catch dolphins”同样歪曲了原文的 see dolphins（看见海豚），catch 是“捕捉”的意思，文章并未说去捉海豚。故选A。

3.3. How many shells did the writer find last year?

A Five.

B Ten.

C Fifteen.

D Twenty.

解析：选C。C 细节理解题。文中直接给出了数字信息：“Last year I found fifteen big shells.”，找到的贝壳数量就是 fifteen，与选项 C 完全对应。A 项 five、B 项 ten、D 项 twenty 都是对数字的随意改动，文中没有依据支持这些数量，所以不予选择。故选C。

4.4. Who will teach the writer to surf?

A His brother.

B His father.

C His mother.

D His sister.

解析：选D。D 细节理解题。文章最后部分说 “My sister is good at surfing. She says she can teach me.”，可以明确教作者冲浪的是作者的姐姐或妹妹。选项中His sister为试题选项固定表述，短文没有交代作者性别。A 项 brother、B 项 father、C 项 mother 文中均未出现，根本没有提到会教冲浪，因此不能选。故选 D。