下列关于声现象的说法中，正确的是（   ）

关于印度的叙述，正确的是                    （    ）

若（2x﹣1）³=a+bx+cx²+dx³，求a+b+c+d的值，可令x=1，得：

（2×1﹣1）³=a+b+c+d，所以a+b+c+d=1．上述条件不变，利用上面的方法，（1）求a的值；（2）能否求出a+c的值？若能，请写出解答过程；若不能，请说明理由．

同学们从电视中都看到过，马戏团的动物们成功表演节目后，驯兽员总是随后给它们喂食．这种做法就是用（　　）

根据材料内容，选择正确答案。

Come to Austria(奥地利)

    Soll is a village in the mountains in western Austria. And the Post Hotel is clean and inexpensive. It is opened by a local family. From the hotel you can see the whole village, the forests and the mountains. Temperatures in summer are usually 20℃ to 25℃ in the daytime, but much cooler by evening.

Enjoy Thailand(泰国)!

    When you visit Bangkok in Thailand, don't miss the early morning river boat trip to the Floating(漂浮) Market just outside the city. There you will find many kinds of fruits and vegetables. And you can pay for them when you sit in your boat. Don't forget your hat: the sun can be strong and it may be as hot as 40℃ at noon.

Visit Hawaii!

    Maybe the most beautiful place in Hawaii is Kauai. You can visit its long, sandy beaches in the south and west of the island, and mountains and forests in the north, but don't be surprised if it rains in the centre of the island. Daytime temperatures there are usually around 24℃ to 26 ℃ by the sea, and only a little cooler by late evening.