问题
选择题
对于在空气中传播的电磁波,下列说法正确的是( ) A.频率越低,波速越大 B.频率越低,波长越长 C.波长越长,波速越大 D.电磁波的波长都相等 |
答案
答案:B
对于在空气中传播的电磁波,下列说法正确的是( ) A.频率越低,波速越大 B.频率越低,波长越长 C.波长越长,波速越大 D.电磁波的波长都相等 |
答案:B
把下列单词填入每个句子的空白处(注意所填单词的形式变化):
2 I ________ that the rude shop assistant should apologize to me. 3 My daughter is so ________ that she cannot easily change her mind. 4 You only have to pay 20 yuan; children travel at half _________. 5 I signed up for the 2007 English Summer _________. 6 The notice is written in German. Is anyone _________ with the German language? 7 The boy was ________ enough to keep chasing after the thief with a knife. 8 Liu Xiang broke the world _________ for the men’s 110-meter hurdle. 9 If you get to Beijing, there are two kinds of ________ for you to choose—by air or train. 10 When you write it is important to use words _________. 11 Fighting against terrorism(恐怖主义) has become an important ______ throughout the world these years. 12 Can you think of ways to _________ him to give up the plan? 13 When people are travelling they often write about their travels, which is called travel _______. 14 The Everest has an ________ of 8844.34 meters, according to the latest survey. 15 After putting on a T-shirt and ________, he went out to play tennis. 16 If you want to pass the exams, you’d better change your ________ towards them. 17 The soil of the Northeast _______ is fertile(肥沃的) and fine corn, sorghum, and rice grow there. 18 Upbringing(培养) plays an important part in _________ a person’s character. |