【单选题】听力原文:M: I can't understand why Mary didn't at least telephone me. W: She did. Didn't I tell you? She said she was sorry she could not come for dinner, but hoped to be able to next time she came to tow...
A.
Mary would not call the woman again.
C.
Mary would call next time she came to town.
D.
That she hoped to come for dinner next time she came to town.
【简答题】(一)X、Y、Z、L、M五种元素的原子序数依次增大,X的阴离子与Y的内层电子数相等,Y原子的最外层电子数是次外层电子数的两倍,Z、L是空气中含量最多的二种元素,M是地壳中含量最高的金属元素.回答下列问题: (1)L的元素名称为______;五种元素的原子半径从小到大的顺序是(用元素符号表示)______. (2)Z、X两元素按原子数目比1:3和2:4构成分子A和B,用电子式表示A的形成过程____...
【单选题】下列几项中,不符合RISC指令系统的特点的是( )。
D.
选取使用频率最高的一些简单指令,以及很有用但不复杂的指令
【单选题】听力原文:Why didn't they go to the restaurant at the Student Center? (7)
A.
They decided that they did not want any coffee.
B.
They thought that the Student Center would be closed.
C.
They thought that the Student Center would be crowded.
D.
The man lost his money in the vending machine.
【单选题】X、Y、Z、W是前20号元素,原子序数依次增大。X是原子半径最小的元素;Y元素原子的最外层电子数是电子层数的2倍;Z元素的-1价阴离子的核外电子排布与氖原子相同,W元素为金属,它的某种化合物可用于烟气脱硫。下列说法错误的是
C.
W元素与Z元素形成的化合物用电子式表示形成过程为:
【单选题】下列选项中,不符合RISC指令系统的特点是_____。
D.
选取使用频率最高的一些简单指令,以及很有用但不复杂的指令
【简答题】From my perspective, I don't subscribe to this idea and I even regard this idea as an obstacle to children’s growth. 2. The supply manager considered the correcting typewriter an unneeded luxury. 3. A...
【简答题】—Ted’s flight from Amsterdam took more than 11 hours. He _____ be very tired after such a long trip. —Yes, especially after working all night before the flight. 2. _____ there is still a long way to g...
【单选题】短周期元素X、Y、Z的原子序数依次递增,其原子的最外层电子数之和为13.X与Y、Z位于相邻周期,Z原子最外层电子数是X原子内层电子数的3倍或者是Y原子最外层电子数的3倍.下列说法正确的是( )
C.
X与Y元素形成的化合物的相对分子质量是100g?mol -1
D.
Y元素形成的单质能在氧气中燃烧但不能在二氧化碳中燃烧
【单选题】下列几项描述中,不符合RISC指令系统的特点是( )。
D.
选取使用频率高的一些简单指令,以及很有用但不负责的指令