已知$\sin x=\frac{\sqrt{3}}{5}\left(\frac{\mathrm{\pi }}{2}<x<\mathrm{\pi }\right)$，则x的值（　　）

⑴Where are your parents?____                           A. Yes, I'd like some fruit.

⑵Is your brother sleeping in the room?____      B. They are at home. 

⑶Can I help you?____                                         C. She's playing the piano.

⑷Would you like some fruit?____                       D. No, I'm not.

⑸Can you see the red light?____                        E. She's singing.

⑹What is Helen doing?____                                F. Yes, please.

⑺Are you busy?____                                           G. No, I can't.

⑻What is she doing in the music room?____     H. No, he isn't.

计算3a$·$2a的结果是（    ）

阅读下面短文，根据语境、音标或所给单词的提示，在每个空格内填入一个恰当的词，要求所填的词意义 准确、形式正确，使短文意思完整、行文连贯。

    The Chongyang Festival is a Chinese traditional festival. It is celebrated on the ninth day of the ninth lunar month. It's also____(call) the Double Ninth Festival.

    The festival started as____/'ɜ:li/ as the Warring States Period (475—221 BC) . It has a history of more than 1,700 years. Among the numbers from zero to nine, nine is the____(high) odd number (奇数). People believe that two "nines" meeting together stand for a long life. So it is a special holiday____Chinese people to show love and respect for their elders. They hold many____(kind) of activities in honor of old people, wishing them good____/helθ/ and a long life.

    The festival comes during the golden time of____/fɔ:l/. On the day, people traditionally drink chrysanthemum (菊花）wine, eat Double-Ninth Cakes____climb mountains. They also carry a kind of plant named dogwood. People in ancient times believed that ____plant could drive away evil (邪恶的）spirits and prevent them from____(catch) an illness in winter.